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OpenStudy (anonymous):
x^2+2x-15 I really just don't understand.
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OpenStudy (anonymous):
it means solve X X'2+2X-15=0 X'2-3X+5X-15=0 x(x-3)+5(X-3)=0 (x-3)=0 0r (x+5)=0 X=3 or X=-5
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