# How do you solve #x^2 +4x=21#?

##### 1 Answer

Mar 26, 2016

By simple factorization. Failing that, by use of the quadratic formula.

#### Explanation:

We are given that

So, if

Mar 26, 2016

By simple factorization. Failing that, by use of the quadratic formula.

We are given that

So, if