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OpenStudy (anonymous):
Factor x2 - x - 90 = 0
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OpenStudy (anonymous):
POOOOOF BISHHH
OpenStudy (unklerhaukus):
\[x^2-x-90=(x+a)(x+b)=x^2+(a+b)x+ab\] \[a+b=-1,\qquad ab=-90\]
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