Question

已知f（x+1）＝x²-3x+2.求f(x)的解析式.

Answer 1

已知f（x+1）＝x²-3x+2

令x+1=t

x=t-1

f(t)=(t-1)方-3(t-1)+2

=t方-5t+6

所以

f(x)=x方-5x+6