Đề sai:\(G=\left(4x+1\right)\left(12x+1\right)\left(3x+2\right)\left(x+1\right)-4\)
\(G=\left[\left(4x+1\right)\left(3x+2\right)\right]\left[\left(12x+1\right)\left(x+1\right)\right]-4\)
\(G=\left(12x^2+11x+2\right)\left(12x^2+11x-1\right)-4\)
\(G=\left(y+2\right)\left(y-1\right)-4\) với \(y=12x^2+11x\)
\(G=y^2+y-2-4\)
\(G=y^2-2y+3y-6\)
\(G=y\left(y-2\right)+3\left(y-2\right)\)
\(G=\left(y+3\right)\left(y-2\right)\)
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