已知(x+3)(x-10)=x²+mx+n,求m,n的值

问题描述:

已知(x+3)(x-10)=x²+mx+n,求m,n的值


(x+3)(x-10)
=x²-10x+3x-30
=x²-7x-30
=x²+mx+n
∴m=-7.n=-30