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OpenStudy (anonymous):
x^2-7x-18
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OpenStudy (unklerhaukus):
\[x^2-7x-18=0\] to factorize , consider the factors of the constant term \[-18=(\pm1)(\mp 18),\quad(\pm2)(\mp9),\quad(\pm3)(\mp6)\]
OpenStudy (unklerhaukus):
find the pair of factors that ( with the right choice of sign) add to give the coefficient of the linear term \[-7=+2-9\]
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