Question

Distribute.

9(2 - 9x^2)

Answer 1

Distributing, you get

`9(2)-9(9x^(2))=18-81x^(2)`

Remember that you have the
`-81x^(2)` instead of
`81x^(2)` because you have a negative in front of the
`9x^(2)`

Answer 2

18 - 81x^2

Explanation:

You have to be careful that you don't destroy that minus sign. The two terms inside the brackets cannot be combined. They will not be able to be combined when you remove the brackets.

Removing the brackets consists of 2 steps (in this case).

9*2: 18

9*9x^2: 9*9x^2 = 81x^2

So the basic answer is 18 81x^2, but what about that minus sing

18 - 81x^2 That minus sign will not go away.