Focus on the inside expression. Factor the red out to get your desired answer.
If it helps, imagine .
We then have:
Hello, Mladen1!
Exactly what is stopping you?I need to prove this and I'm having some trouble doing it.
. .
[1] Multiply out both sides and show that they are equal! . . . Duh!
[2] Or we can factor the left side . . .
. .
. . . . . common factor
. . . . . . . . .
. .