Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Linear Programming

Question:

Calculate the shaded area as given below :

Options:

$\frac{8}{3}sq.units $

$\frac{8}{5}sq.units $

$3\, sq.units $

$8\, sq.units $

Correct Answer:

$\frac{8}{3}sq.units $

Explanation:

The correct answer is option (1) → $\frac{8}{3}$ sq.units

area is symmetric about x

so computing one sides area and multiplying by 2

area = $2×\left(\int\limits_{-2}^2\frac{x}{2}+1dx-\int\limits_0^2\sqrt{2x}dx\right)$

$=2\left[\left[\frac{x^2}{4}+x\right]_{-2}^2-\left[\frac{2}{3}\sqrt{2}×\sqrt{x}\right]_0^1\right]$

$=2\left[4-\frac{2}{3}\sqrt{2}×2\sqrt{2}\right]$

$=2[\frac{4}{3}]=\frac{8}{3}$ sq. units