\(-9(7x-8y)=-63x+72y\)

\(5+(-2a+7)=5-2a+7=-2a+12\)

\(6-(-9p-2)=6+9p+2=9p+8\)

\(2(7a-3)=14a-6\)

\(4(-8x+6)+2(-7x-9)=-32x+24-14x-18=-46x+6\)

\(-6a(-5a+9)=30a^2-54a\)

\((3p+4)+(8p-2)=3p+4+8p-2=11p+2\)

\((3x+9)-(-4x-6)=3x+9+4x+6=7x+15\)

\(8(-5p+9q+2)=-40p+72q+16\)

\((9a+7)(6b+3)=54ab+27a+42b+21\)

\((-8x-2)(7x-4)=-56x^2+32x-14x+8=-56x^2+18x+8\)

\((x-9)(x-4)=x^2-4x-9x+36=x^2-13x+36\)

\((a+5)^2=a^2+10a+25\)

\((9x-2)^2=81x^2-36x+4\)

\((3a-6b)^2=9a^2-36ab+36b^2\)

\((x+4)(x-6)(x-3)=(x+4)(x^2-9x+18)=x^3-9x^2+18x+4x^2-36x+72=x^3-5x^2-18x+72\)

\(a(a-7)(a+2)=a(a^2-5a-14)=a^3-5a^2-14a\)

\((6a-5b)(6a+5b)=36a^2-25b^2\)

\((5x-9)(5x+9)=25x^2-81\)

\((p+2)(p-2)=p^2-4\)