anonymous
  • anonymous
Solve x2 + 10x = -21.
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
do i add 21 to both sides?
Vocaloid
  • Vocaloid
yes x^2 + 10x + 21 = 0 now factor
anonymous
  • anonymous
(x + 10 ) (x + 11 )??

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anonymous
  • anonymous
Vocaloid
  • Vocaloid
nope, not quite what two numbers have a sum of 10 and a product of 21?
anonymous
  • anonymous
(x+7) (x+3)?
Vocaloid
  • Vocaloid
good! that gives us (x+7)(x+3) = 0 now solve for x
anonymous
  • anonymous
x=-7 x=-3 ?
Vocaloid
  • Vocaloid
great, that's it ^_^
anonymous
  • anonymous
thank you

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