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OpenStudy (anonymous):
(Y+7)^2-56=0
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OpenStudy (anonymous):
=>Y^2 +14Y+49-56=0. =>Y^2 +14Y -7 =0. =>NOW USE \[{-b \pm \sqrt{b ^{a}-4ac}}\]
OpenStudy (anonymous):
oops not \[b^{a} but b^{2}\]
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