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**Qasim**- Replies: 2

I have the equation y = x^3 + 12x - 9

Doing x = k and x = k+h I am doing differentiation

Anyway you get:

k^3 + 3k^2h + 3kh^2 + h^3 + 12k + 12h - 9 - (k^3+12k-9)

over k+h-k

Anyway I cancel the k's at the bottom and then divide the top by h

Now the answer states

3k^2h + h^3 +12h

Over h

I dont get how they got rid of the 3kh^2

**Qasim**- Replies: 1

My name is Qasim and I have to do some Maths for my Accounting Degree

I had an A* grade at GCSE but its been a while and my maths is a bit rusty

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