Q. The maximum slope of the curve $y = - x^{3} + 3 x^{2} + 2 x - 27$ is

2656 183 KCETKCET 2021Application of Derivatives Report Error

A

1

15%

B

23

32%

C

5

30%

D

-23

22%

Solution:

Slope $m = \frac{d y}{d x} = - 3 x^{2} + 6 x + 2$
$\frac{d m}{d x} = 0; - 6 x + 6 = 0$
$x = 1; m = - 3 + 6 + 2 = 5$