f(x-1)=2x^2-x求f(x)的導數

f(x-1)=2x^2-x求f(x)的導數

令t=x-1
則x=t+1
f(x-1)=f(t)=2(t+1)^2-(t+1)=2t^2+4t+2-t-1=2t^2+3t+1
所以f(x)=2x^2+3x+1
求導
=4x+3