Bài làm:
Ta có: \(3x^2+3x-6\)
\(=\left(3x^2+6x\right)-\left(3x+6\right)\)
\(=3x\left(x+2\right)-3\left(x+2\right)\)
\(=3\left(x-1\right)\left(x+2\right)\)
\(3x^2+3x-6\)
\(=3\left(x^2+x-2\right)\)
\(=3\left(x^2+2x-x-2\right)\)
\(=3\left[x\left(x+2\right)-\left(x+2\right)\right]\)
\(=3\left(x-1\right)\left(x+2\right)\)
3x2 + 3x - 6
= 3x2 + 3x - 6x - 6
= 3x( x + 1 ) - 6( x + 1 )
= ( x + 1 )( 3x - 6 )
-..-
3x2 + 3x - 6
= 3x2 - 3x + 6x - 6
= 3x( x - 1 ) + 6( x - 1 )
= ( x - 1 )( 3x + 6 )
Xin lỗi vì sự nhầm lẫn :(