Simplify.

-4(3x-3)+9(x+1)

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Simplify `-4(3x-3) +9(x+1)` .

Use the distributive property: `a(b+c) = ab+ac.`

`-12x + 12 + 9x + 9`

Now combine like terms.

`-3x + 21`

or `-3(x-7)`

Approved by eNotes Editorial
An illustration of the letter 'A' in a speech bubbles

Multiply `-4` by each term inside the parentheses.

`12-12x+9(x+1)`


Multiply `9` by each term inside the parentheses.

`12-12x+9x+9 `


Add `9` to `12 ` to get `21` .

`21-12x+9x`


Since `-12x` and `9x` are like terms, subtract `9x` from `-12x` to get `-3x` .


Thus, the answer is `-3x + 21`

``

Approved by eNotes Editorial
An illustration of the letter 'A' in a speech bubbles

The expression -4(3x-3)+9(x+1) has to be simplified.

-4(3x-3)+9(x+1)

First, open the brackets.

= -4*3x - 3*-4 + 9*x + 9

= -12x + 12 + 9x + 9

Combine similar terms

= -3x + 21

The simplified form of the expression -4(3x-3)+9(x+1) is -3x + 21

See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial