### Home > CALC > Chapter 3 > Lesson 3.3.4 > Problem3-134

3-134.
1. For each of the following, find the second derivative with respect to x. Homework Help ✎

1. y = 8x99

2. f(x) = 7 − 2 cos x

$y=8x^{99}$

$\frac{dy}{dx}=(99)8x^{98}=792x^{98}$

$\frac{d^{2}y}{dx^{2}}=\underline{ \ \ \ \ \ \ \ }$

(98)(99)8x97 = 77,616x97

Refer to part (a) for further guidance. Remember to rewrite the square root with an exponent before proceeding.

Refer to part (a) for further guidance.

Refer to part (a) for further guidance.