# How do you factor #5a - 20 #?

##### 2 Answers

May 15, 2016

#### Explanation:

We begin with

There, that's it.

May 15, 2016

#### Explanation:

To factor this expression, tell yourself

"I need a number (or variable) that 'go into' both 5a and -20.

Well, 5 is a factor of 5 and -20.

So 5 go into 5a (1a times).

That sounds confusing, but remember, 5 go into 5 one time, but in algebra, you don't normally write the number 1 in coefficient, so it's just 'a'. 5 can't go into 'a' because a is just a single variable.

5 can go into 20, 4 times.

So now our final answer will be 5(a-4).

Hopefully this make sense!