# Math(Urgent)

posted by
**Hannah**
.

Differentiate.

g(x)=(x^3+1)(3x^2-1)

I know that the answer is

15x^4-3x^2+6x but I donot know how to get to this. I was using

g'(x) X h(x) + g(x) X h'(x) and I was using the derivatives 3x^2 and 6x but I guess this is wrong. Please help!! Thank you.