Calculating y for 0 to 1: A Step-by-Step Guide

  • Thread starter Mugen Prospec
  • Start date
In summary, the arc length of the given function y = 5 + 8x^(3/2) from 0 to 1 is approximately 0.5786. The process to find this value involves taking the derivative of the function, squaring it, and then using the integral of the square root of 1 plus the squared derivative. However, there may be a typo in the given answer and it is recommended to double check the result.
  • #1
Mugen Prospec
42
0

Homework Statement


y = 5 + 8x^3/2 from 0 to 1


Homework Equations





The Attempt at a Solution


I have tried it a few times Keep getting variations of 1+ 12[tex]\sqrt{12}[/tex]. I would like some to give me a step by step how to work it. Something is killing me on this I am lost.
 
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  • #2
Show us what you've tried and we can go from there.
 
  • #3
Arc length is the Integral of sqrt(1+(f '(x))^2) so Derivative of the equation is 12x^1/2. Then I believe you are supposed to square that. Thats the same as (sqrt(12x))^2 right? so I tired it like that I also did 12x^1/2 * 12x^1/2= 144x so then I know you finish of the integral. I used U substitution to do that.
 
  • #4
Roughly: [tex]\int{\sqrt{1+144x}}\:dx = \frac{1}{216}(1 + 144x)^{3/2}[/tex]
 
  • #5
miqbal said:
Roughly: [tex]\int{\sqrt{1+144x}}\:dx = \frac{1}{216}(1 + 144x)^{3/2}[/tex]
You're going to have to back up, since your integrand is wrong. Show us what you did to get the part under the radical.j

Edit: Never mind. I misread the exponent as 3, rather than 3/2.
 
Last edited:
  • #6
I'm not the original poster dude.

[tex]s = \int_{a}^{b} \sqrt { 1 + [f'(x)]^2 }\, dx.[/tex]

[tex]f(x) = 5 + 8x^{\frac{3}{2}}[/tex]

[tex]f'(x) = 12x^{\frac{1}{2}}[/tex]

[tex][f'(x)]^{2} = 144x[/tex]

[tex]s = \int_{0}^{1} \sqrt { 1 + 144x }\, dx = {\frac{1}{216}(1 + 144x)^{3/2}}\left|^{1}_{0}[/tex]
 
  • #7
ok i have got to the that point is that answer right? then you just substitute the 1 in and that's the answer? I just want to know that I did it right my online homework is picky about the answer format.
Thanks to all
 
  • #8
Mugen, you should be able to check your work (or the posted work) for errors.

Yes, substituting 1 and 0 in is the correct procedure for evaluating this definite integral. Be more confident!
 
  • #9
miqbal said:
I'm not the original poster dude.

[tex]s = \int_{a}^{b} \sqrt { 1 + [f'(x)]^2 }\, dx.[/tex]

[tex]f(x) = 5 + 8x^{\frac{3}{2}}[/tex]

[tex]f'(x) = 12x^{\frac{1}{2}}[/tex]

[tex][f'(x)]^{2} = 144x[/tex]

[tex]s = \int_{0}^{1} \sqrt { 1 + 144x }\, dx = {\frac{1}{216}(1 + 144x)^{3/2}}\left|^{1}_{0}[/tex]

Looks fine. I misread the exponent in the original problem as x^3 rather than x^(3/2).
 
  • #10
OK I just put it in and it said it was wrong so I don't care anymore. I think its right as do all of you so I am going with the homework having a typo in the answer.
Thanks again
 
  • #11
Your answer should be [tex]\frac{1}{216}(145^{3/2} - 1) [/tex]
which can also be written as
[tex]\frac{1}{216}(145\sqrt{145} - 1)[/tex]
 

1. How do I calculate y for 0 to 1?

To calculate y for 0 to 1, you will need to use the equation y = mx + b, where m is the slope and b is the y-intercept. You will also need to have a value for x, which represents the input value. Plug in the values for m, b, and x into the equation and solve for y. This will give you the corresponding y value for the input x.

2. What is the significance of calculating y for 0 to 1?

Calculating y for 0 to 1 is commonly used in linear equations to find the value of the dependent variable (y) for a given independent variable (x). This can help in understanding the relationship between the two variables and making predictions based on the data.

3. Can I use this guide for non-linear equations?

No, this guide specifically focuses on calculating y for linear equations. For non-linear equations, the process will be different and may require other mathematical techniques.

4. What if I don't have a value for the slope or y-intercept?

If you don't have a value for the slope or y-intercept, you can use other methods such as graphing or finding the equation of a line to determine these values. Once you have the values, you can then follow the steps in this guide to calculate y for 0 to 1.

5. Is this guide applicable for all ranges of x?

Yes, this guide can be used for any range of x as long as the equation is linear. However, if the values for x are very large or very small, it may be more accurate to use scientific notation or a computer program to perform the calculations.

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