# How do you factor #25b^2 - 20by + 4y^2#?

##### 1 Answer

#### Explanation:

The first term is a perfect square:

The third term is a perfect square:

So we MIGHT have

We know that

Yes, it is, so we have:

# = 25b^2 - 20by + 4y^2#

The first term is a perfect square:

The third term is a perfect square:

So we MIGHT have

We know that

Yes, it is, so we have:

# = 25b^2 - 20by + 4y^2#