1.b^2+bc-bc-c^2=b^-c^2
2.ax+a^2-x^2-ax=a^2-x^2
3.y^2-16
4.p-1+p^2-p=-1+p^2
5.4x^2+2x-2x+1=4x^2+1
6.5mk+m^2-25k^2-5km=m^2-25k^2
7.3p-1+9p^2-3p=-1+9p^2
8.4my-16y^2+m^2-4ym=-16y^2+m^2
1.b^2+bc-bc-c^2=b^-c^2
2.ax+a^2-x^2-ax=a^2-x^2
3.y^2-16
4.p-1+p^2-p=-1+p^2
5.4x^2+2x-2x+1=4x^2+1
6.5mk+m^2-25k^2-5km=m^2-25k^2
7.3p-1+9p^2-3p=-1+9p^2
8.4my-16y^2+m^2-4ym=-16y^2+m^2