>281

sorry.

f(x)=(x+1)(x-1){A(x)}+2x+1

A(x)=(x+2){B(x)}+r
→f(x)=(x+1)(x-1)[(x+2){B(x)}+r]+2x+1

f(-2)=4*(-2)-1=-9
→r=?
→f(x)=(x+1)(x-1)(x+2){B(x)}+r(x+1)(x-1)+2x+1
→R(x)=r(x+1)(x-1)+2x+1