Bài 2.
a) \(6x^2+12xy=6x\left(x+2y\right)\)
b) \(3x+12-\left(x^2+4x\right)\)
\(=3x-x^2+12-4x\)
\(=x\left(3-x\right)+4\left(3-x\right)\)
\(=\left(3-x\right)\left(x+4\right)\)
c) \(x^2+2xy+y^2=\left(x+y\right)^2\)
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