Maclaurin series of f(x) and explanation?

Question

Write out the first four terms of the Maclaurin series of f(x) if:

f(0)=−11, f′(0)=8, f′′(0)=−4, f′′′(0)=−13

I get -11 + 8x + (-4x^2 / 2!) + (-13x^3 / 3!) but this is wrong apparently, why?

Answer 1

Try simplification:

(-4x²)/2! = -2x²

(-13x³)/3! = (-13/6)x³