General Math Forum

Post thread
Join in expert discussion on general math topics that are not applicable to the specific categories. This includes topics are usually high school math level. Homework help is available.

Math Proof Training and Practice

A gap in resources that should help students visualise mathematics

Math Guides, Tutorials and Articles

MHB Deriving the first and second order Newton-Cotes formulas

Math Problem of the Week

Undergrad Sum of an Alternating Series
High School Question about the rounding off rule.
  • · Replies 2 ·
Replies
2
Views
2K
High School How do you calculate all the possible combinations on a Rubik's cube?
  • · Replies 4 ·
Replies
4
Views
7K
MHB Can You Prove $6^{33}>3^{33}+4^{33}+5^{33}?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Solving system of inequalities
  • · Replies 12 ·
Replies
12
Views
4K
MHB Deriving potential energy by simulation method
  • · Replies 1 ·
Replies
1
Views
2K
MHB Parity equivalent to the system
  • · Replies 7 ·
Replies
7
Views
2K
MHB How Does Modulo Arithmetic Prove a Combinatorial Identity Involving Primes?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Plus sign in triangle usage (or minus, times)
  • · Replies 1 ·
Replies
1
Views
4K
Undergrad Can someone please explain the elevator paradox?
  • · Replies 5 ·
Replies
5
Views
5K
MHB Why Does Modulus Primality Matter in Congruences?
  • · Replies 9 ·
Replies
9
Views
2K
MHB There are infinitely many composite numbers
  • · Replies 14 ·
Replies
14
Views
4K
MHB What is the Simplified Form of the Trigonometric Expression?
  • · Replies 3 ·
Replies
3
Views
2K
MHB Is There a Solution to the Challenge of Inequality?
  • · Replies 2 ·
Replies
2
Views
2K
MHB How Does 31.7 Equal 1.6% in This Math Problem?
  • · Replies 1 ·
Replies
1
Views
1K
MHB Electromagnetic Induction: Problem 30.85 in Halliday and Resnick and Walker
  • · Replies 8 ·
Replies
8
Views
3K
MHB Prove the given equation has no solution
  • · Replies 4 ·
Replies
4
Views
2K
MHB No Positive Integer Solution for $4xy - x - y = z^2$
  • · Replies 8 ·
Replies
8
Views
3K
MHB Order of operation and why this gives the wrong answer?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Is the "space" between one and two infinite?
  • · Replies 16 ·
Replies
16
Views
7K
MHB Are Both Solutions to the Diophantine Equation $x^4 - 2y^2 = 1$ Valid?
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Why Do People Misunderstand Mathematical Proofs of Nonexistence?
  • · Replies 31 ·
2
Replies
31
Views
5K
Undergrad Mean distance between points of 2D array
  • · Replies 5 ·
Replies
5
Views
3K
High School Sierpinski Triangle: Equilateral or Isosceles?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad B-spline and NURBS curve example
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Equation general of conic in polar coordinates
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Calculate number of roads/lines a line crosses
  • · Replies 2 ·
Replies
2
Views
2K
MHB Find m+n in $P(x)=x^3-6x^2+17x$ given $P(m)=16$ and $P(n)=20$
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Probably a stupid question regarding 4-dimensional space
  • · Replies 16 ·
Replies
16
Views
6K
Undergrad Simple geometric series question
  • · Replies 8 ·
Replies
8
Views
2K
MHB Proving $b^2-4ac \leq \frac{1}{8}$
  • · Replies 2 ·
Replies
2
Views
1K
MHB Elementary Algebra" by Hall & Knight: A Beginner's Guide
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Can You Find the Best Constant for Sum-Free Subsets?
  • · Replies 32 ·
2
Replies
32
Views
9K
MHB How Does One Calculate Z from Electric Field Equations?
  • · Replies 2 ·
Replies
2
Views
2K
MHB Solving Resistors in a Circuit: Working Backwards
  • · Replies 5 ·
Replies
5
Views
2K
MHB Help with circuits and their different symbols
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Can The Human Body Be Expressed Mathematically?
  • · Replies 35 ·
2
Replies
35
Views
6K
MHB Find Solution to Power & Resistance w/ 10 Ohm Resistors
  • · Replies 3 ·
Replies
3
Views
4K
MHB Prove A_n is an integer for all n in N
  • · Replies 1 ·
Replies
1
Views
2K
High School Is 3.62566 an Irrational Number?
  • · Replies 19 ·
Replies
19
Views
4K
MHB Remainder of $3^{2^n}-1$ Divided by $2^{n+3}$
  • · Replies 5 ·
Replies
5
Views
2K
MHB Are the solutions of the diophantine equations right?
  • · Replies 19 ·
Replies
19
Views
7K
MHB Mesh currents, emfs, and resistances
  • · Replies 4 ·
Replies
4
Views
2K
MHB Solve triple square Diophantine equation
  • · Replies 3 ·
Replies
3
Views
2K
MHB Quickly Calculate $\text i^{n}$ Values
  • · Replies 2 ·
Replies
2
Views
1K
MHB Summation Problems: Solve Delta ti * T(Delta ti) for Age in Days
  • · Replies 1 ·
Replies
1
Views
1K
MHB Prove $\left(\begin{matrix}n\\1\end{matrix}\right)=n$ - Help Needed
  • · Replies 3 ·
Replies
3
Views
2K
MHB Show that there are no a,b such that a^n-b^n | a^n + b^n
  • · Replies 11 ·
Replies
11
Views
3K
MHB Evaluate Fraction: 30^4+324 to 78^4+324
  • · Replies 5 ·
Replies
5
Views
2K
MHB Polynomial Challenge: Find $k$ Integral Values
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Find A Counter-Example to This
  • · Replies 4 ·
Replies
4
Views
2K
MHB Proving the Compositeness of n^4+1: A Scientific Approach
  • · Replies 11 ·
Replies
11
Views
3K
High School Can Mathematical Errors Lead to False Equations?
  • · Replies 17 ·
Replies
17
Views
2K
MHB Solving a Challenge: Finding Real x to Satisfy an Equation
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Help understanding coefficient formula
  • · Replies 2 ·
Replies
2
Views
2K
High School Terminology for exponentiation and logarithms
  • · Replies 1 ·
Replies
1
Views
3K
MHB Answer: Calculate Electric Field Strength at 1mm for a Stationary Electron
  • · Replies 1 ·
Replies
1
Views
2K
MHB Solve for the coordinates of square
  • · Replies 3 ·
Replies
3
Views
2K
High School Questions about the (Spatial) Fourth Dimension
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Can the sinh and cosh functions be expressed in terms of each other?
  • · Replies 8 ·
Replies
8
Views
3K
MHB Proving Divisibility: Does a^n Divide b^n Imply a Divides b?
  • · Replies 4 ·
Replies
4
Views
2K
MHB Simplify a trigonometric expression
  • · Replies 7 ·
Replies
7
Views
2K
MHB Why is the implication obvious?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Learning maths concepts …not just how to do an equation
  • · Replies 3 ·
Replies
3
Views
2K
MHB Is 27x^6+27x^3y^3+8y^6 Composite for Positive Integers x and y?
  • · Replies 2 ·
Replies
2
Views
2K
MHB Solve for a & b: Real Number Pairs $(a,\,b)$
  • · Replies 2 ·
Replies
2
Views
2K
MHB Description of how to solve six middle school geometry problems
  • · Replies 1 ·
Replies
1
Views
2K
MHB QR Code Length: Examining the Fixed Size of QR Codes
  • · Replies 2 ·
Replies
2
Views
1K
MHB Real Solutions to $a-b+c-d=0; ab=cd; a^2-b^2+c^2-d^2=-24;a^2+b^2+c^2+d^2=50$
  • · Replies 3 ·
Replies
3
Views
1K
MHB How Can I Correctly Derive the Quadratic Equation from a Train Speed Problem?
  • · Replies 8 ·
Replies
8
Views
4K
Undergrad Solving 0x^2 + ax + b = 0: Why Different Results?
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Solve Polynomial Riddle: Find Coefficients & Rank
  • · Replies 6 ·
Replies
6
Views
5K
MHB Triangle Inequality: $a^4-1, a^4+a^3+2a^2+a+1, 2a^3+a^2+2a+1$
  • · Replies 4 ·
Replies
4
Views
2K
High School Geometry Prep for 8th Grader Caleb: Links, Advice & Experiments
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Algebraic manipulation of equation
  • · Replies 2 ·
Replies
2
Views
2K
MHB How Many Photons Does a Laser Emit in a Single Pulse?
  • · Replies 10 ·
Replies
10
Views
10K
MHB Find the Min Sum of $m$ and $n$ for $(4^m+4^n)\ mod\ 100=0$
  • · Replies 2 ·
Replies
2
Views
1K
MHB Finding the Sum of $w,x,y,z$ Given $2^w+2^x+2^y+2^z=20.625$
  • · Replies 2 ·
Replies
2
Views
1K
MHB Can an Equilateral Triangle be Formed with Rational Vertices on the X-Axis?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Sides of a triangle given an area and an equation.
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad General form of the solutions of polynomials
  • · Replies 14 ·
Replies
14
Views
3K
High School How many roots does x^3.14 have?
  • · Replies 13 ·
Replies
13
Views
3K
MHB Solve the trigonometric equation
  • · Replies 3 ·
Replies
3
Views
2K
High School Does the function f(x) = ax+b have a discriminant? If so, what is it?
  • · Replies 5 ·
Replies
5
Views
2K
High School Basic Trig Functions: Clarifying Definitions
  • · Replies 12 ·
Replies
12
Views
2K
MHB Finding the Sum of Cubes for Rational Numbers with Integer Roots
  • · Replies 2 ·
Replies
2
Views
1K
MHB What are the real values of $k$ that satisfy the trigonometric inequality?
  • · Replies 1 ·
Replies
1
Views
1K
MHB Proving - properties of quadratic roots
  • · Replies 6 ·
Replies
6
Views
2K
MHB Rational & Real Roots in Quadratic Equations: Explained
  • · Replies 6 ·
Replies
6
Views
3K
MHB Inequality Challenge: Prove $b^3+a^3 \le 2$
  • · Replies 2 ·
Replies
2
Views
2K
MHB Is my solution for the tank word problem correct?
  • · Replies 1 ·
Replies
1
Views
2K
MHB Solving Equation (Application)
  • · Replies 6 ·
Replies
6
Views
2K
MHB Maximizing Profit: Solving a Quadratic Equation for Mango Sales
  • · Replies 1 ·
Replies
1
Views
2K
High School Why Does Raising a Negative Number to a Power Yield a Negative Result?
  • · Replies 29 ·
Replies
29
Views
5K
Graduate Question on Elements of Algebra by Euler
  • · Replies 5 ·
Replies
5
Views
2K
MHB What Does the -1 Index Mean in the Abbreviation km h^-1?
  • · Replies 2 ·
Replies
2
Views
2K
MHB How Do You Find the Length x in a Geometric Problem with Shaded Areas?
  • · Replies 3 ·
Replies
3
Views
3K
MHB Find K Values: Solve Equations w/ One Solution | Help
  • · Replies 8 ·
Replies
8
Views
2K
MHB Can You Prove Inequality Challenge II?
  • · Replies 2 ·
Replies
2
Views
1K
MHB Quadratic equation application
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Why do we need postulate 4 in Euclid's element (P14)?
  • · Replies 2 ·
Replies
2
Views
3K