We have to find the area enclosed between y=x^2 - 2x + 2 and y = -x^2 + 6.
First lets find the points of intersection
x^2 - 2x + 2 = -x^2 + 6
=> 2x^2 - 2x - 4 = 0
=> x^2 - x - 2 = 0
=> x^2 - 2x + x - 2 = 0
=> x(x - 2) +1(x - 2) = 0
=> (x + 1)(x - 2) = 0
x = -1 and x = 2
Integrate the two expressions x^2 - 2x + 2 and -x^2 + 6 between the limits x = -1 and x = 2.
Int[ x^2 - 2x + 2 ] = x^3/3 - x^2 + 2x + C
Within the limits: 2^3/3 - 2^2 + 2*2 + C - (-1)^3/3 + (-1)^2 - 2*(-1) + C
=> 8/3 - 4 + 4 + C + 1/3 + 1 + 2 + C
=> 6
Int [ -x^2 + 6 ] = -x^3/3 + 6x + C
Within the limits x = -1 and x = 2
=> -2^3/3 + 6*2 + C + (-1)^3/3 + 6*(-1) + C
=> -8/3 + 12 - 1/3 - 6
=> 3
But in this interval the two curves are curved in different directions as one curve has the term x^2 and the other has -x^2. So we have to add the areas.
The enclosed area is 9.
See eNotes Ad-Free
Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.
Already a member? Log in here.