Test Index

JAMB Mathematics 2019 Paper

© africaexams.com

Question : 71

Total: 73

If y = 8x

{}^3

{}^2

\frac{d^2 y}{d x^2}

.

48x - 6
11x ${}^2$ + 6x - 7
32x + 7
24x ${}^2$ - 6x + 7

Solution:

y = 8x ${}^3$ - 3x ${}^2$ + 7x - 1

$\frac{d^2 y}{d x^2} = \frac{d}{d x} \left( \frac{d y}{d x} \right)$

= $\frac{d}{d x} (24x^2 - 6x + 7)$

$\frac{d^2 y}{d x^2} = 48x - 6$

© africaexams.com

Go to Question:

Prev Question

Next Question