Question

Evaluate the following and show your work: 5a (a - 1) (a + 1)

Answer 1

(a-1)(a+1)5a= \[(a^2 -1)5a\]

Answer 2

\[(a^2 -1)5a= 5a^3-5a\]

Answer 3

Remember that (a-1)(a+1) is the difference of two squares. or you can foil them and find the same thing

Answer 4

Now I get it. Been working on this off and on for a week, and was just about to give up. Thank you so much for your help.

Answer 5

no problem