(1+x)(1-x)+(x+2)²-(x+1)(2x-3)=1-x²+x²+4x+4-(2x²-x-3)=1-x²+x²+4x+4-2x²+x+3=-2x²+5x+8=-2x*x+5x+8=-3x+5x+8=2x+8=3+8=11