Question

已知函数f（x-1）=x方-4x,则函数f（x+1）的表达式为：

Answer 1

f（x-1）=x^2-4x

=(x-1)^2-2x-1

=(x-1)^2-2(x-1)-2-1

=(x-1)^2-2(x-1)-3

f（x）=x^2-2x-3

f（x+1）=(x+1)^2-2(x+1)-3

=x^2+2x+1-2x-2-3

=x^2-4