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Mathematics 17 Online
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

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

Miracrown (miracrown):

Right!

Miracrown (miracrown):

1 * 4 2 * 2 which add up to -5 ?

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