Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Application of Integrals

Question:

The maximum area of a rectangle whose two vertices lie on th x-axis and two on the curve y = 3 - |x|, -3\(\leq x \leq \) 3 is : 

Options:

9

\(\frac{9}{2}\)

3

none of these

Correct Answer:

\(\frac{9}{2}\)

Explanation:

Area : A = 2x (3 - x)

A' = 2x (3 - x) - 2x 

x = 3/2

Maximum area of the rectangle occurs when x = 3/2

maximum area = 2.[3/2][3-\frac{3}{2}\)] = 9/2 sq. units