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?

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- Oct 29th 2013, 08:54 PM #1

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- Oct 30th 2013, 07:40 AM #2

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## Re: plllz help question is below

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