因式分解:6x∧3+x∧2-3x-1
问题描述:
因式分解:6x∧3+x∧2-3x-1
答
6x^3+x^2-3x-1
=6x^3+3x^2-2x^2-3x-1
=3x^2(2x+1)-(2x^2+3x+1)
=3x^2(2x+1)-(2x+1)(x+1)
=[3x^2-(x+1)](2x+1)
=(3x^2-x-1)(2x+1)
答
6x³+x²-3x-1
=6x³+x²-3x-1
=6x³+x²-x-2x-1
=x(3x-1)(2x+1)-(2x+1)
=(2x+1)(3x²-x-1)