# Math Help - Polynomial functions

1. ## Polynomial functions

This is probably easy but how do you solve this?

x*4 - 7x*2 + 4 = 0

And if you have the answer I would like to know what it is

Thanks

2. Originally Posted by Helzfire134
This is probably easy but how do you solve this?

x*4 - 7x*2 + 4 = 0

And if you have the answer I would like to know what it is

Thanks
i suppose you mean $x^4 - 7x^2 + 4 = 0$?

Here's a hint: note that this is the same as $(x^2)^2 - 7(x^2) + 4 = 0$

now let $y = x^2$, then we have

$y^2 - 7y + 4 = 0$

this is a quadratic equation, which is easier for you to solve (hopefully). now find y. when you do, you can find x