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OpenStudy (anonymous):
Help!!! please Which of the binomials below is factor of this trinomial? X^2-5x+4 A)X-1 B)X+4 C)X+1 D)X^2+4
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Miracrown (miracrown):
What do you think?
Miracrown (miracrown):
we'd need two numbers that multiply to give +4 and add to give -5 ... since 4 is positive, they need to have the same sign
Miracrown (miracrown):
So since they add to give -5, they are both negative
Miracrown (miracrown):
What are the factors of 4 ?
OpenStudy (anonymous):
2 and 4 and 1
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Miracrown (miracrown):
Right!
Miracrown (miracrown):
1 * 4 2 * 2 which add up to -5 ?
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