(4x的3次方-31x+15)怎么解,

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(4x的3次方-31x+15)怎么解,(4x的3次方-31x+15)怎么解,(4x的3次方-31x+15)怎么解,4X^3-31X+15=x(4x^2-25)-6x+15=(2x-5)(2x^2+5x

(4x的3次方-31x+15)怎么解,
(4x的3次方-31x+15)怎么解,

(4x的3次方-31x+15)怎么解,
4X^3-31X+15=x(4x^2-25)-6x+15=(2x-5)(2x^2+5x-3)=(2x-5)(x+3)(2x-1)
X^3+5X^2+3X-9=(x-1)(x+3)^2