# What are all the possible rational zeros for #f(x)=2x^4-9x^2+7#?

##### 1 Answer

The rational roots are

#### Explanation:

Let

This is simply a matter of factoring now, remember, to find the zeroes, you **must** set the equation equal to zero:

Using the quadratic formula:

(*Note that a was used rather than x, as a is the variable used in the quadratic equation, we are finding the roots of a)*

Recall

Thus,

Therefore, as the question is asking for rational roots only,

Hope this helped, formatting took so long :P