Sketch the region enclosed by y= 6|x| and y = x^2 -7

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Homework Help Overview

The discussion revolves around finding the area enclosed by the functions y = 6|x| and y = x^2 - 7. Participants are exploring how to determine the limits of integration for evaluating the integral of the area between these two curves.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss setting the functions equal to each other to find intersection points, particularly addressing the challenge posed by the absolute value in 6|x|. There are suggestions to consider piecewise definitions for the absolute value function and to analyze the problem for different cases based on the sign of x.

Discussion Status

There is an ongoing exploration of how to handle the absolute value function and the implications for solving the equations. Some participants have provided insights into piecewise definitions and the symmetry of the functions, but no consensus has been reached on the limits of integration.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may limit the methods they can use or the depth of exploration allowed. The discussion includes considerations of how to approach the absolute value function and the implications for finding intersection points.

apiwowar
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i know that the way to solve this is by evaluating the integral from a to b of the first function minus the second one but how would i solve for x to find out what the limits of integration should be?

if you set them equal to each other you get 6|x| = x^2 - 7
but I am not exactly sure what to do with the |x|
 
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like rootX said, when dealing with absolute value functions, it's usually best to define it peace-wise.

f(x) = 6x for x >= 0
-6x for x < 0

Or you could notice that the two functions are even, and you could thus solve for x using 6x, and keep in mind that there is another intersection point opposite the y-axis.
 
apiwowar said:
i know that the way to solve this is by evaluating the integral from a to b of the first function minus the second one but how would i solve for x to find out what the limits of integration should be?

if you set them equal to each other you get 6|x| = x^2 - 7
but I am not exactly sure what to do with the |x|
If x\ge 0, |x|= x so this is 6x= x^2- 7 which is the same as x^2- 6x- 7= 0.

If x< 0, |x|= -x so this is -6x= x^2- 7 which is the same as x^2+ 6x- 7= 0.
 

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