分解因式4x^3-31x+15
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分解因式4x^3-31x+15
4x^3-31x+15
=4x^3-x-30x+15
=x(4x^2-1)-15(2x-1)
=x(2x+1)(2x-1)-15(2x-1)
=(2x^2+x-15)(2x-1)
=(2x-5)(x+3)(2x-1)
=4x^3-x-30x+15
=x(4x^2-1)-15(2x-1)
=x(2x+1)(2x-1)-15(2x-1)
=(2x^2+x-15)(2x-1)
=(2x-5)(x+3)(2x-1)