因式分解5x²+4xy-28y²

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因式分解5x²+4xy-28y²
因式分解5x²+4xy-28y²

因式分解5x²+4xy-28y²
原式=5x²-10xy+14xy-28y²
=5x(x-2y)-14y(x-2y)
=(5x-14y)(x-2y)

5x²+4xy-28y²=(5x+14y)(x-2y)

5x²+4xy-28y²=(5x+14y)(x-2y)

5x²+4xy-28y²
=5x²+4xy-(14*2)y²
=5x²+4xy+14*(-2)y²
=(5x+14y)(x-2y)
个人观点,仅供参考~

(5x+7y)(x-2y)

原式=(5x+14y)(x-2y)

=5x²-10xy+14xy-28y²
=5x(x-2y)-14y(x-2y)
=(5x-14y)(x-2y)