# How do I find the answer?

##### 2 Answers

Jan 17, 2018

#### Explanation:

Differentiate twice! Using chain rule:

Using power rule,

Jan 17, 2018

Answer 'D' or

#### Explanation:

So to find the second order derivative we must differentiate it twice.

I would recommend multiplying out the brackets before doing the differential (it will make the algebra easier in the end)

and

Factorising by 16 yields;