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OpenStudy (anonymous):
factor this -y^2+17y-72
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OpenStudy (anonymous):
\[(-y ^{2}+17y)-72 = -(y ^{2}-17y)-72 = -(y ^{2}-17y+289/4)-72+289/4\] \[= -(y-17/2)^{2}+1/4\]
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