6X^2-11XY-10Y^2因分解 6x^2+7x-20クロス乗算

6X^2-11XY-10Y^2因分解 6x^2+7x-20クロス乗算

6X^2-11XY-10Y^2
=(2x-5y)(3x+2y)
6x^2+7x-20
=(3x-4)(2x+5)