Friday, January 18, 2013

Calculate the area enclosed by y = X^2 and y = x + 2.

y= x^2


y=
x+2


To find the area will need to find the integral for both
equations:


First we need to determine the intersecting
points:


==> x^2 = x+
2


==> x^2 -x -2 = 0


==>
(x-2)(x+1) = 0


==> x= 2   x =
-1


Then we need to find the integral from x= -1 to x=
2


First let us find the area under y= x^2 from x= -1 to
2


==> A1 = intg ( x^2 )
dx


           = x^3/3


            = (
2^3/3) - (-1)^3 / 3


            = ( 8 + 1)/3 = 9/3 =
3


Then the area under y=x^2 from (-1 to 2 ) is  3 square
units>


Now we will calculate the area under y=
x+2:


A2 = intg (x+ 2)


    = x^2/2 +
2x


       = ( 2^2/2 + 2*2) - ( -1^2/2 +
2*-1)


        = 2 + 4) - ( 1/2 -
2)


       = 6 + 3/2 = 15/2 = 7.5 square
units:


Then the area is:


A = A2 - A1 =
7.5 - 3 = 4.5


Then, the area between y= x^2 and y=
x+2  is 4.5 square units

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