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The area bounded by $|y| = \sqrt x$ and $\sqrt x = |y| + 2$ is equal to A. $\dfrac {22}3$ B. $\dfrac {20}3$ C. $\dfrac {16}3$ D. $\dfrac {14}3$
1 Answer
| written 9.4 years ago by |
SOLUTION :

Shaded portion is the area bounded. For the point of intersection A and B solving
$ y^2 = x $ & $ |y| = x - 2$
$(x - 2 )^2 = x \Rightarrow x^2 - 5x + 4 = 0 \Rightarrow x = 1, 4 $
$\Rightarrow x = 4 (as \space x \neq1) $
$|y| = x-2= 2\Rightarrow y = ±2$
Area bounded = $2\int\limits_0^{2} = [(y+2) -y^2] dy =2\bigg[\dfrac {y^2}2 +2y-\dfrac {y^3}3\bigg]_0^2 =2\Big[2+4-\dfrac 83\Big]=\dfrac{20}3$ sq.units