Wednesday, October 9, 2013

Find the area between y= x and f(x) = x^2

Given the line  y= x and the parabola f(x)=
x^2.


To find the area between the line and the parabola, we need to
determine the intersection points between the line and the curve.


To
find the intersection points, we will caculate x values such that y =
f(x).


==> x^2 = x


==> x^2
- x = 0


==> x ( x-1) =
0


==> x= 0 , 1


Now we will
determine the area under the line y= x between x= 0 and x=
1.


==> A1 = integral
y


              = intg x 
dx


              = x^ 2/2 


==>
A1 = (1/2) - 0/2 = 1/2


Now we will calculate the area under the
curve f(x) = x^2 and x= 0 and x= 1.


==> A2 = intg f(x)
dx


              = intg x^2
dx


                = x^3 /3 +
C


==> A2 = 1/3 - 0 = 1/3


Then,
the area between y and f(x) is:


A = A1 - A2 = 1/2 - 1/3 =
1/6


Then the area = 1/6 square
units.

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