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OpenStudy (keke1551):
Factor this polynomial completely. If it will not factor, type PRIME. x^2+13x+42
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OpenStudy (ivettef365):
what multiple of 42, will add to 13 ???
OpenStudy (keke1551):
ummm , i dont know
OpenStudy (mathstudent55):
What _factors_ of 42 add to 13?
OpenStudy (mathstudent55):
Yes you know. This is just knowing the multiplication tables. What two numbers multiply to 42 and add to 13?
OpenStudy (keke1551):
7*6=42
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OpenStudy (keke1551):
so the answer is (x+7)(x+6) ??
OpenStudy (mathstudent55):
You got it. See, you did know it.
OpenStudy (keke1551):
thanks
OpenStudy (mathstudent55):
wlcm
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