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Double Differentiation

If y=x3, then...

Question

If $y = x^{3}$ , then $\frac{d^{2} y}{d x^{2}}$ is

A

6 x^{2}

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B

6 x

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C

3 x^{2}

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D

3 x

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Solution

The correct option is B $6 x$
$y = x^{3}$
$d y / d x = 3 x^{2}$
$\frac{d^{2} y}{d x^{2}} = 6 x$

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