\(6x^2-7x-20\)
\(=6x^2+8x-15x-20\)
\(=2x\cdot\left(3x+4\right)-5\left(3x+4\right)\)
\(=\left(3x+4\right)\left(2x-5\right)\)
\(6x^2-7x+1=6x^2-6x+1\)
\(\left(x-1\right)-\left(x-1\right)=\left(6x-1\right)\left(x-1\right)\)
6x2 - 7x - 20
= 6x2 - 15 + 8x - 20
= 3x ( 2x - 5 )+ 4 ( 2x - 5 )
= (3x+4) (2x-5)
phân tích đa thức thành nhân tử: 4x2 + 6xy + y2
\(6x^2-7x-20\)
\(=6z^2+8x-15x-20\)
\(=2x\left(3x+4\right)-5\left(3x+4\right)\)
\(=\left(3x+4\right)\left(2x-5\right)\)