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OpenStudy (anonymous):
Solve: x^2-81=0 Please show how to solve step by step.
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OpenStudy (anonymous):
\[x^2=81\] \[x=9\] or \[x=-9\]
OpenStudy (anonymous):
Factor (x+9)(x-9)=0 solve: (x+9)=0 x=-9 (x-9)=0 x=9
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