# How do you factor #49x^2-144#?

##### 2 Answers

#### Answer:

(7x+12)(7x-12)

#### Explanation:

This problem is known as a 'perfect square.' The square root of 49 is 7 and the square root of

Firstly, multiply the first numbers/variables: 7

Secondly, multiply the outer numbers/vars.: 7

Thirdly, multiply the inner numbers/vars.: 7

Lastly, multiply the last numbers/vars.:12

The two number, 84

*One CAN'T use this perfect square method IF the equation has a plus instead of a minus.*

#### Answer:

#### Explanation:

Factor:

This is a difference of squares. Use the formula:

where:

Plug in the known values for