# How do you factor #y^2 + 0.4y + 0.04#?

##### 1 Answer

Oct 12, 2017

#### Answer:

You can use a process popularly known as **completing the square**

#### Explanation:

This is how it works: **Add** and **subtract** the **square of half the coefficient** of *y* to the expression .

The coefficient of y is **0.4**. Half of it is

The square of

Adding and subtracting

Rearrange that and you get a factorisable expression.