Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Continuity and Differentiability

Question:

If $y=x^2 \log x$ then $\frac{d^2 y}{d x^2}=$

Options:

$\left(x^2+2 x+1\right) \log x$

$\log \left(3 e ~x^2\right)$

$\log \left(x+x^2\right)$

$\log \left(e^3 x^2\right)$

Correct Answer:

$\log \left(e^3 x^2\right)$

Explanation:

The correct answer is Option (4) - $\log \left(e^3 x^2\right)$

$y=x^2 \log x$

$\frac{dy}{dx}=2x\log x+x$

$\frac{d^2y}{dx^2}=2\log x+2+1$

$=\log x^2+3\log_e$

$=\log e^3x^2$