已知二次函数f（x）=ax^2+bx+c,且f(0)=0,f(1)=2,f(-2)=2,求a,b,c的值

Question

如题所述

Answer 1

f(0)=0, c=0
f(1)=a+b=2 (1)
f(-2)=4a-2b=2 (2)
(1)*2+(2)
6a=6, a=1
b=1