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OpenStudy (anonymous):
Hey guys, help me factor this x^2+21x+100
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OpenStudy (mertsj):
It is prime
OpenStudy (mertsj):
There are no factors of 100 whose sum is 21
OpenStudy (anonymous):
25 and 4 would work if it were a -100 at the end.
OpenStudy (anonymous):
yea...cause 25 and 4 can not give me product of 100 and sum of 24
OpenStudy (anonymous):
You can check also by using quadratic formula - if it yields irrational solutions, then the quadratic is prime.
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OpenStudy (anonymous):
ok
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