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for this x2 - 12x + 27 how do you know if its (x+3) or (x-3) the plus and minus confuse me :s

Mathematics
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x1.x2=27 x1+x2=12
so x1=3 and x2=9
when you made x=x1or x2 you must get a zero

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Other answers:

so p(x)=(x-x1).(x-x2)
@RaphaelFilgueiras (x + 3) (x + 9) (x – 3) prime these are the choices it gave me.
so p(x)=(x-3).(x-9)
ok thanks c: @RaphaelFilgueiras
you are welcome

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