37: Ta có: \(A=8x^2-2x-3\)
\(=8x^2-6x+4x-3\)
\(=2x\left(4x-3\right)+\left(4x-3\right)\)
\(=\left(4x-3\right)\left(2x+1\right)\)
38: Ta có: \(A=8x^2+2x-3\)
\(=8x^2+6x-4x-3\)
\(=2x\left(4x+3\right)-\left(4x+3\right)\)
\(=\left(4x+3\right)\left(2x-1\right)\)
39: Ta có: \(A=-8x^2+5x+3\)
\(=-8x^2+8x-3x+3\)
\(=-8x\left(x-1\right)-3\left(x-1\right)\)
\(=\left(x-1\right)\left(-8x-3\right)\)
40: Ta có: \(A=8x^2-10x-3\)
\(=8x^2-12x+2x-3\)
\(=4x\left(2x-3\right)+\left(2x-3\right)\)
\(=\left(2x-3\right)\left(4x+1\right)\)
41: Ta có: \(A=8x^2+10x-3\)
\(=8x^2+12x-2x-3\)
\(=4x\left(2x+3\right)-\left(2x+3\right)\)
\(=\left(2x+3\right)\left(4x-1\right)\)
42: Ta có: \(A=-8x^2+23x+3\)
\(=-8x^2+24x-x+3\)
\(=-8x\left(x-3\right)-\left(x-3\right)\)
\(=\left(x-3\right)\left(-8x-1\right)\)
43: Ta có: \(A=8x^2-23x-3\)
\(=8x^2-24x+x-3\)
\(=8x\left(x-3\right)+\left(x-3\right)\)
\(=\left(x-3\right)\left(8x+1\right)\)
44: Ta có: \(A=10x^2-11x-6\)
\(=10x^2-15x+4x-6\)
\(=5x\left(2x-3\right)+2\left(2x-3\right)\)
\(=\left(2x-3\right)\left(5x+2\right)\)
45: Ta có: \(A=-10x^2+11x+6\)
\(=-10x^2+15x-4x+6\)
\(=-5x\left(2x-3\right)-2\left(2x-3\right)\)
\(=\left(2x-3\right)\left(-5x-2\right)\)
