Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section A

Chapter

Applications of Derivatives

Question:

The greatest and least values of the function f(x) = ax + b$\sqrt{x}$ + c, when a > 0, b > 0, c > 0 in the interval [0, 1] are

Options:

a + b + c and c

a/2 b$\sqrt{2}$ + c, c

$\frac{a+b+c}{\sqrt{2}}, c$

None of these

Correct Answer:

a + b + c and c

Explanation:

$f'(x)=a+\frac{b}{2 \sqrt{x}}>0 ~\forall~ x \in[0,1]$

Hence f(x) will be minimum at 0 and maximum at x = 1