Answers

2015-06-30T18:06:23+08:00
(x-9) (x+12)= 0
(x) (x) = -12 +9
x^2 = -3
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2015-06-30T18:41:05+08:00
(x-9)(x+12)=0
x²+12x-9x-108=0
x²+3x-108=0
i hope i help you :) :) :)
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