# How do you use the rational root theorem to find the roots of #x^4 – 7x^2 + 12 = 0#?

##### 1 Answer

Oct 28, 2015

#### Answer:

Evaluation of

gives the roots

#### Explanation:

According to the Rational Root Theorem in its simplified form

when

if

For the given example, this means that any rational root of

The factors of

We can test each of these factors (as I did with Excel, below) to find all rational roots of