Question

若(ax+y)(x-y)=2x^3+bxy-y^2，求a+b的值。

要有过程哟、根据初二学的多项式与多项式相乘来解答..

Answer 1

(ax+y)(x-y)=ax^2+xy-axy-y^2=ax^2+(1-a)xy-y^2=2x^3+bxy-y^2
a=2x,b=1-2x.a+b=2x+1-2x=1