x^2-4x+m=(x+3)(x-7),m=
问题描述:
x^2-4x+m=(x+3)(x-7),m=
答
-21
(X+3)(X-7)=X^2-4X-21
x^2-4x+m=(x+3)(x-7),m=
-21
(X+3)(X-7)=X^2-4X-21