已知函数f(x+1)=x²,求f(x)

Question

如题所述

Answer 1

f(x) = (x-1)²追问

tell me why

追答

令：y= x+1 所以：x=y-1
因为：f(x+1) =x²

所以：f(y) = (y-1)²
也即函数：f(x) = (x-1)²