3x^2-9x-12=0 by completing the square
with explanation if possible.

3x^2-9x-12=0 by completing the square
with explanation if possible.

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divide the whole thing by 3

x^2-3x-4=0

\[3(x^2-3x-4) = 0 \rightarrow 3(x^2-3x)=4\]

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