f(2x-1)＝x^2+xlety=2x-1x= (1/2)(y+1)f(2x-1)＝x^2+xf(y)=[(1/2)(y+1)]^2 + [(1/2)(y+1)]=(1/4)(y+1)^2 + (1/2)(y+1)=(1/4)y^2 + y + 3/4ief(x) =(1/4)x^2 + x + 3/4
