Root Definition and 918 Threads

Homework Statement I have found this video where there is this problem: Find the cube root of 1 Homework Equations I have found this video: Where from 8:02 to the end she solves this problem.The Attempt at a Solution My question is why is she making such a big fuss about this? Is the...

I have a quick question. How does the following look? Proposition: Every extension of degree 2 is a root field. Proof: Let F be a field. Let p(x) ε F[x] and suppose p(x) has degree n. Then p(x) has n roots, say c1,c2,...,cn. Let E be the extension of F that contains the...

Homework Statement At the end I get the answer: sqrt(sqrt(3)+2) It can be show that it is ( sqrt(6)+sqrt(2) ) / 2 How do I show this?, I have tried, to attempt it my manipulating the expression, but I can't seem to manage it.

1. Graph the following function 2. \sqrt[3]{(x^{2}-1)^{2}} 3. I got the first derivative to be \frac{4x}{3\sqrt[3]{x^{2}-1}} but am having trouble with the second derivative to get the concavity. So far I have...

IDK if this should be in the precalc section, but I was wondering how to reduce \sqrt{(3+\sqrt{5})} / \sqrt{(3-\sqrt{5})} to (\sqrt{5} + 1) /(\sqrt{5} - 1)

In what branches of mathematics is this proven.. I have never seen a proof, so I wonder if anyone can give me the basics of what is done to proove it or got a link to a proof.. Edit: By square root I mean the positive square root.

Lets take a prime number and raise it to m/n where m and n are coprime. x,y are coprime and I want to show that this is irrational. Proof: let's assume for the sake of contradiction that P^{\frac{m}{n}}=\frac{x}{y} P is prime and m,n,x,y are integers. no we take both sides to the...

Part (b) of theorem 3.20 is to prove that the limit as n approaches infinity of the nth root of p equals one(for p>0). The proof given in the text uses some inequality derived from the binomial theorem which seems to me to just come out of nowhere and provide a completely unintuitive proof...

Suppose I have to solve for y: x\leq 1 (x - 1)^{2} = y So I know that (x - 1) will always be 0 or a negative, therefore I must take the negative square root of (x - 1): -\sqrt{(x - 1)^{2}} = -\sqrt{y} Am I to understand that this is the same as: -1 \cdot \sqrt{(x - 1)^{2}} = -1 \cdot...

Let $a,b \in \mathbb{Z}$, and if $a+b\sqrt{2}$ has a square root in $\mathbb{Q}(\sqrt{2})$, then the square root is actually in $\mathbb{Z}[\sqrt{2}]$. Only one approach comes to my mind. Let $r_1, r_2 \in \mathbb{Q}$ such that $a+b\sqrt{2}=(r_1+r_2\sqrt{2})^2$. This gives $a=r_1^2+2r_2^2...

I was playing trying to work through a proof in Apostol's Calculus and can't quite understand a step noted. This is from chapter 3, theorem 1.35. Every nonnegative real number has a unique nonnegative square root. The part where you are establishing the set S as nonempty so you can use LUB it...

i am having trouble showing that \mathbb{Q}(\sqrt{p*}) \subset \mathbb{Q}(\zeta_{p}) where p* = (-1)^{\frac{p-1}{2}}p . in other words, if p = 1 (mod 4) then p* = p and if p = 3 (mod 4) then p* = -p. i encountered this in the context of galois theory and i have no idea how to start. it seems...

Homework Statement If X^2=Sqrt(x1^2+x2^2+x3^2+...)=> X? and vice versa If X=x1+x2+x3+...=> X^2? Homework Equations The Attempt at a Solution

Years back i learned the digit-by-digit calcualtion of square root like this : http://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Digit-by-digit_calculation But i don't know why this works. Wikipedia gives kind of an explanation but i don't understand it. How does this method work?

I have a question; Let m have a prime factor p \equiv 1 (mod 4). Then Euler function \varphi(m) is divisible by 4. Let x = r^{\varphi(m)}, then m|(x^4-1) and x^4-1=(x^2-1)(x^2+1). As gcd(x^2-1,x^2+1)|2, either x^2-1 or x^2+1 is divisible by m. My book says here because of the nature of a...

Homework Statement Integrate: sqrt(1/4 + t^2 + t^4)The Attempt at a Solution I'm really not sure on how to go about integrating this, it's actually integrate from -1 to 1, the solutions manual has a method I'm not familiar with. I thought of factorising it first, although doing that hasn't...

Homework Statement I have been hung up on this integral: (μ /4∏ε) ∫ dz/(√s^2 + z^2) Homework Equations The Attempt at a Solution i have tried a couple of different u-substitutions, and none are getting me anywhere. I do not that partial fractions, or by parts would help...

Every paper I read about cross-section measurements from colliders has a line saying (for example): ...positron-electron annihilations at \sqrt{s} = 40 GeV are studied... 1) What does this mean? I'm guessing it means that in the CM frame, the energy of each beam is 40 GeV. 2) Why use...

Hello! I'm having trouble understanding the method/reasoning behind finding the root of an equation though iterative convergence. x2 - 4x + 1 = 0 x2 = + 4x - 1 x = 4 - 1/x I can understand that once we input a 'root' the equation will equal be equal on both sides. (Due to the remainder...

line integral -- confusion on squares and square root terms Homework Statement Do you see where they have sqrt(16 sin^2t etc = 5? How do they get that, the answer should be 7, the square root of 16 is 4, sin^2 + cos^2 is 1 and the square root of 9 is 3, 3 + 4 = 7. It's like they're...

Hi, simple question, but difficult to find an answer for me How to integrate sqrt((ax+b)/x) dx ? a,b constants and x variable if it matters, I would be happy if you could solve it just for both a,b >0 Thanks

Homework Statement The solution of the nonlinear equation x^5-P=0 gives the fifth root of the number P. A numerical solution of the equation can be calculated with Newton’s method. The solution process starts by choosing a value x1 as a first estimate of the solution. Using this value, a...

By chance I stumbled on this "almost" equality: \frac{1}{5}(1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10) ≈ √2 - 7.2×10^{-6} I'm just wondering, are these funny coincidences simply, well, coincidences :biggrin: or is there some kind of explanation? I've see a ton of other funny stuff like...

I am trying to prove sqrt(3) is irrational. I figured I would do it the same way that sqrt(2) is irrational is proved: Assume sqrt(2)=p/q You square both sides. and you get p^2 is even, therefore p is even. Also q^2 is shown to be even along with q. This leads to a contradiction. However...

ay'' + by' + cy = 0 1) for [SIZE="2"] 2 distinct roots,the solution should be y = Ae^m1x + Be^m2x 2) for [SIZE="3"][SIZE="3"]Real and equal roots should be y = e^mx(A + Bx) that is it. So if same roots as the 2nd one,one solution is y1(x)=Ae^mx, what about the second solution...

Hey guys, I was looking at an exam I did last year and tried to solve a question, which at the time I couldn't do. Unfortunately I'm running into the same problem I had during the exam, so hear me out on this one Question: The graph below has equation y =ax(x-b)(x+c)^d. Write down the values...

Homework Statement How does one find the root of f(x) = x^3 - x - 1 ? Quadratic Equation only works on power of 2. I can't factor out an x to get a first term of x^2 because then Quadratic equation still won't work because the middle and last term would be messed up, I think. What...

Is it possible to find √n using only the times table and the 4 operations?

what is the quickest way to find \sqrt[3]{n} [on a pocket calculator] whitout using any \sqrt{} or log key?

Homework Statement y''-4y'+4y=x*e2x I'm trying to find the homogenous solutions of this equation. I know there are two, but I can only find one. Y[SIZE="1"]H=> y''-4y'+4y=0 Homework Equations The Attempt at a Solution y''-4y'+4y=0 Using the characteristic function...

America made a lot of enemies so they need a powerful military -or- America has a powerful military so they made a lot of enemies?

Homework Statement Define f(x)=\sqrt{}(x + (\sqrt{}(x + \sqrt{}x) Determine where f is differentiable and compute the derivative Homework Equations f'(xo)= lim as x approaches xo (f(x) - f(xo))/(x - xo) The Attempt at a Solution By the definition, f(x) = \sqrt{}x does not have a...

Homework Statement The problem and solution are included. Homework Equations Double integration. The Attempt at a Solution Firstly, I'd like to mention that the additional ρ under the square root is there accidentally and that it should be outside of the square root such that it...

Homework Statement Here is the question: I don't quite know what I did wrong. My method is below. Homework Equations The Attempt at a Solution f(x)=√x f'(x)=\frac{1}{2(x)^{1/2}} f''(x)=\frac{-1}{(2)(2)(x^{3/2}} a=4 f(a)=2 f'(a)=1/4...

Homework Statement Use Newton’s Method to approximate the indicated root of the equation to correct six decimal places. The root of 2.2x5 – 4.4x3 + 1.3x2-0.9x-4.0=0 in the interval [-2, -1] USE MAPLE. Homework Equations Newtons'method. The Attempt at a Solution I am...

Homework Statement 2t^3-4t-5=0 Find t Homework Equations [-b-sqrt(b^2-4ac)]/2a The Attempt at a Solution The answer is sqrt(2/3). No idea how this came about. I tried plugging in the equation and got it wrong. :( Please help I've been struggling over this for 5 hours.

I'm having a little bit of trouble figuring out how exactly to do this. Prove that \sqrt{n+\sqrt{n+\sqrt{n+\sqrt{n+\sqrt{n+\cdots}}}}} = \frac{1\pm\sqrt{4n+1}}{2}. How exactly does one go about doing this? I mean, I understand it goes on infinitely, but doesn't that create an infinitely...

\lim_{x\to +\infty}\sqrt{x^2+3}-x sorry first of all how do you turn this string into latex I don't see the icon tool on the editor thnx

How do you prove that there does not exist numbers a,b\in\mathbb{Q} such that 0 = a + b\sqrt[3]{2} + \sqrt[3]{2}^2

Homework Statement Show that there exists one root int (0,2) of the following function: f(x)=(1-x^2)^2-√((1-x^2)*(1-1/2*x^2)) Homework Equations The Attempt at a Solution I first found: f(0)=0 and f(2)=7.268 But, i don't know what to do now. I'm not sure if it has...

I have a 4th order differential equation with given -2 +3i root. Now need to find the homogenous solution. Well, if the root was real, it would be easier but now I'm stuck and don't know how to proceed. What am I supposed to do to solve this ? Equation is : d4y(t)/dt4 +6d3y(t)/dt3 +...

when installing ROOT in ubuntu 11.10 i have the following message name@ubuntu:~/root$ ./configure Checking for source directory ... /home/waleed/root Configuring for linuxx8664gcc Checking for GNU Make version >= 3.80 ... ok Checking for C compiler ... gcc Checking for C++ compiler ...

Hi Let \( c>0 \) be a real number. Then I am trying to prove that \( \forall\; n\in\mathbb{N}\; (c^{1/n} >0) \). I let \(n\) be arbitrary and then tried to use method of contradiction. But ran into difficulties. Is there another approach ?

Homework Statement Let a be a positive real number. Prove that if a is irrational, then √a is irrational. Is the converse true? Homework Equations So, an irrational number is one in which m=q/p does not exist. I understand that part, but then trying to show that the square root of an...

Homework Statement Let nεZ>0. Prove that: Ʃ1/√(i) ≥ √(n) The Attempt at a Solution I'm not sure where to begin, this feels like it should be an induction problem, but I'm not sure how to show that √(n) + 1/√(i+1) ≥ √(n+1). There doesn't seem to be any obvious algebra that would...

Homework Statement Prove that Prove that the equation has at least one positive real root, using the Intermediate Value Theorem on an appropriate function. 3 arctan(2x-1)=cos^2(x-(∏/6)) + 1 Homework Equations No clueThe Attempt at a Solution I honestly speaking have no clue how to even...

Hi. I am currently doing an experiment regarding to the factors affecting beet root cell membrane. Some of them are pH (2,4,6,8,10) , Ethanol (1%, 25%, 50%) and Detergent(1%, 5%). I've seen that different pH, different concentration in ethanol and detergent each has different results in both...

Homework Statement Solve \sqrt{-e^{(i2\pi)/3}} Homework Equations The Attempt at a Solution I seem to be missing something simple, as I take: \sqrt{-1} = i then, e^{(1/2)*(i2\pi)/3} which comes out as: ie^{i\pi/3} however, the solution is: -ie^{i\pi/3}, and I can't seem to see where...

Homework Statement Given that 2 is a repeated root of the equation 2x^3 + px^2 + qx -4 = 0, find the third root and the values of p and q. Homework Equations b^2 - 4ac(?) The Attempt at a Solution Since it said 2 is a root I plugged in 2 as the value of x and rearranged the...

i just want to make sure I'm doing this correctly as there is some discrepancy in my textbook. i know the centroid is equal to (Ʃpoles - Ʃzeros) / (# of poles - # of zeros) the equation i have is s2 + 2s + 8 / s(s2 + 2s + 10) so the zeros are -1 + i√7 and -1 - i√7 and the poles are 0, -1...