# How do you factor #5n^2+10n+20#?

##### 2 Answers

May 19, 2015

y = 5(n^2 + 2n + 4)

The expression in parentheses can't be factored because D < 0

May 19, 2015

We must find its roots and then transform them into factors.

Using Bhaskara we get:

However,

We know, by imaginary numbers definition, that

Imaginary roots cannot be factors.