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OpenStudy (anonymous):
solve the equation r square =2 r+15
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OpenStudy (anonymous):
Hi are you looking to solve this by hand or with a graphing calculator?
OpenStudy (anonymous):
by hand
OpenStudy (anonymous):
\[r^2 = 2r+15\] \[r^2-2r-15=0\] Can you see how to factor that?
OpenStudy (anonymous):
what two number when you multiply them give you -15, and when you add them give you -2?
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