



Use binomial theorem
to expand
.

Use the distributive property to multiply 3x+1 by 3x-5 and combine like terms.

To find the opposite of 9x²-12x-5, find the opposite of each term.

Cancel 9x² and -9x² to get 0.

Combine 12x and 12x to get 24x.

Add 4 and 5 to get 9.
