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OpenStudy (anonymous):
4x^2 - 81 = 0, solve for x.
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OpenStudy (anonymous):
this is a difference of square
OpenStudy (anonymous):
I know it's a difference of square, but I need it to be x^2-81, don't I? I have a 4 right there that I can't factor out.
OpenStudy (anonymous):
nvm got it
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