baby456
  • baby456
Fan +Medal help with factoring x^2-x-72
Mathematics
katieb
  • katieb
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misssunshinexxoxo
  • misssunshinexxoxo
x^2-x-72 =x^2-9x+8x-72 x(x-9)+8(x-9) (x-9)(x+8)
baby456
  • baby456
still cconfused
misssunshinexxoxo
  • misssunshinexxoxo
Ok do you know how to factor?

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anonymous
  • anonymous
(x+8)(x-9)
misssunshinexxoxo
  • misssunshinexxoxo
@baby456 do you need more explanation?
baby456
  • baby456
yes
anonymous
  • anonymous
look at the middle section realise that -x is the same as -9x+8x do you get that part? @baby456
baby456
  • baby456
no
anonymous
  • anonymous
then try thinking of it without the x -1 = -9+8 now do you understand? @baby456

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