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Question
Math
Posted 11 months ago
Lit
Find the area of the region bounded by y=x22xy = x^2 - 2x and y=xy = -x.
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Answer from Sia
Posted 11 months ago
Solution by Steps
step 1
To find the area between the curves y=x22x y = x^2 - 2x and y=x y = -x , we need to set up the integral of the top function minus the bottom function from the leftmost to the rightmost points of intersection
step 2
First, find the points of intersection by setting x22x=x x^2 - 2x = -x . Solving this gives x2x=0 x^2 - x = 0 , which has solutions x=0 x = 0 and x=1 x = 1
step 3
The integral setup is 01((x22x)(x))dx \int_{0}^{1} ((x^2 - 2x) - (-x)) dx , which simplifies to 01(x2x)dx \int_{0}^{1} (x^2 - x) dx
step 4
Compute the integral 01(x2x)dx \int_{0}^{1} (x^2 - x) dx to find the area
step 5
The antiderivative of x2x x^2 - x is x33x22 \frac{x^3}{3} - \frac{x^2}{2}
step 6
Evaluate the antiderivative from 0 to 1: [x33x22]01=(133122)(033022) \left[\frac{x^3}{3} - \frac{x^2}{2}\right]_{0}^{1} = \left(\frac{1^3}{3} - \frac{1^2}{2}\right) - \left(\frac{0^3}{3} - \frac{0^2}{2}\right)
step 7
Simplify to get the area: 1312=2636=16 \frac{1}{3} - \frac{1}{2} = \frac{2}{6} - \frac{3}{6} = -\frac{1}{6} . Since area cannot be negative, we take the absolute value
Answer
16\frac{1}{6}
Key Concept
Area between two curves
Explanation
The area between two curves is found by integrating the difference of the functions (top function minus bottom function) over the interval defined by their points of intersection.

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