# How do you factor the expression #4x^2 - 7x - 15#?

##### 1 Answer

#### Answer:

I will let you finish this off

#### Explanation:

Possible factors of 15 are 1 and 15 or 3 and 5

Possible factors of 4 are 1 and 4 or 2 and 2

Let try

The 15 has to be negative that means that one of the constants is positive and the other is negative

Looks as though we are going to need to use the formula!

a=4; b=-7; c=-15

I will let you finish this off

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If you are not sure what you can use to take the root of; use a factor tree. This is the one I built for