Câu 2:
\(a,=2x\left(x^2-4x+4\right)=2x\left(x-2\right)^2\\ b,=2x\left(y+1\right)+z\left(y+1\right)=\left(2x+z\right)\left(y+1\right)\\ c,=\left(x+1\right)^2-y^2=\left(x+y+1\right)\left(x-y+1\right)\)
Câu 3:
\(a,\Leftrightarrow x^2-36-x^2-6x-9=9\\ \Leftrightarrow-6x=54\Leftrightarrow x=-9\\ b,\Leftrightarrow\left(2x-1-5x+5\right)\left(2x-1+5x-5\right)=0\\ \Leftrightarrow\left(4-3x\right)\left(7x-6\right)=0\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{4}{3}\\x=\dfrac{6}{7}\end{matrix}\right.\)
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