# Math Help - plllz help question is below

1. ## plllz help question is below

the graphs of y=x^4 and y=7x^2-10 (just the x squared) intersect at 4 points with x coordinates plus or minus sqrt(m) plus or minus sqrt(n) where m>n what is m-n?

2. ## Re: plllz help question is below

Where they intersect, $y= x^4= 7x^2- 10$ which is equivalent to $x^4- 7x^2+ 10= 0$. If you let $u= x^2$ that becomes the quadratic equation $u^2- 7u+ 10= 0$. So it is easy to solve for the values of x.