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steps are shown in the picture above
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apologiabiology
minus 4x+12 both sides
x^2-4x-12=0
what multipies to -12 and add to -4
-6 and 2
(x-6)(x+2)=0
set to zero
x-6=0
x=6

x+2=0
x=-2

x=-2 and 6

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