f(x)=5x^2-4x-3f(x)=-3x^2+5x-8配方
问题描述：
f(x)=5x^2-4x-3
f(x)=-3x^2+5x-8
配方
答
f(x)=5x²-4x-3=5(x²-4x/5)-3=5[(x-2/5)²-4/25]-3=5(x-2/5)²-4/5-3=5(x-2/5)²-19/5f(x)=-3x²+5x-8=-3(x²-5x/3)-8=-3[(x-5/6)²-25/36]-8=-3(x-5/6)²+25/12-8=-3(x-5/6)&...