Wednesday, February 3, 2016

Determine the area of the region bounded by y=x^3 and y=square root x.

First, we need to determine the intercepting points of the
given curves. These points will represent the necessary limits of
integration.


Since y = x^3 and y = `sqrt(x)` , we'll equate
and we'll get:


x^3 =
`sqrt(x)`


We'll raise to square both sides to remove the
square root:


x^6 = x


We'll
move the terms in x to the left:


x^6 - x =
0


We'll factorize by x:


x(x^5
- 1) = 0


x1 = 0 and x2 = 1


The
lower limit of integration is x = 0 and the upper limit is x =
1.


Since the graph of the function `sqrt(x)` is above the
graph of the function x^3, over the interval [0;1], we'll determine the area evaluating
the definite integral of the difference `sqrt(x)` -
x^3.


1                           1              
1


`int` `sqrt(x)` - x^3 dx = `int` `sqrt(x)` dx - `int`
x^3dx


0                        0               
0


1


`int` ` ` - x^3 dx =
[2x^(3/2)]/3 (0 -> 1) - x^4/4
(0->1)


0


We'll apply
Leibniz Newton
formula:


1


`int` ` ` - x^3 dx
= 2/3 -
1/4


0


1


`int`
` ` - x^3 dx = (8 -
3)/12


0


1


`int`
` ` - x^3 dx =
5/12


0


The area
of the region bounded by y = x^3 and y = `sqrt(x)` is A = 5/12 square
units.

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