Need help foiling my problem.

My problem is:
(x² -3x -54)(x +6)

I got this:
x³+3x²-72-324

you forgot the x on 72x but yea its right

This is = (x +6) (x² -3x -54)
= x(x² -3x -54) + 6(x² -3x -54)
= x^3 -3x^2 - 54x + 6x^2 - 18x - 324
= x^3 + 3x^2 - 72x -324

x^3 + 6x^2 -3x^2 - 18x -54x -324
simplifying we get
x^3 + 3x^2 -72x - 324

Itz -72x n rest is correct