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Mathematics 8 Online
OpenStudy (anonymous):

Factor x^2 – 8x + 15

OpenStudy (skullpatrol):

Any ideas?

OpenStudy (anonymous):

1*15

OpenStudy (skullpatrol):

But the linear term is negative so they both must be negative, right?

OpenStudy (anonymous):

only -8x is

OpenStudy (skullpatrol):

Yes, the factors must add up to -8, so they both must be negative.

OpenStudy (anonymous):

what are the steps

OpenStudy (skullpatrol):

$$\huge x^2 – 8x + 15=(x-?)(x-?)$$

OpenStudy (anonymous):

(x )( x ) 5*3 -5*-3 15*1 -15*-1

OpenStudy (anonymous):

so it's-5 and -3

OpenStudy (skullpatrol):

Correct.

OpenStudy (anonymous):

thx

OpenStudy (skullpatrol):

Thanks for trying to understand.

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