What are the zeros of y-7=4x^2

and Solve square root of 2x^2 - sqaure root of 2 = 0

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- Oct 26th 2008, 02:55 PMGigabytesneed help please :)
What are the zeros of y-7=4x^2

and Solve square root of 2x^2 - sqaure root of 2 = 0 - Oct 26th 2008, 04:38 PMterr13
$\displaystyle y-7 = 4x^2$

$\displaystyle -7 = 4x^2$

Never true in the reals.

$\displaystyle \sqrt(2x^2) - \sqrt(2) =0$

$\displaystyle (\sqrt(2x^2)-\sqrt(2))(\sqrt(2x^2)+\sqrt(2)) =0$

$\displaystyle 2x^2 -2 =0$

$\displaystyle x^2 -1 = 0$

$\displaystyle x = -1 \, or\, 1$