\(-9(6x-7y)=-54x+63y\)

\(-4+(3a+7)=-4+3a+7=3a+3\)

\(5-(3p-9)=5-3p+9=-3p+14\)

\(-9(-6a+7)=54a-63\)

\(2(-9x-3)+4(-7x-8)=-18x-6-28x-32=-46x-38\)

\(2a(-3a+6)=-6a^2+12a\)

\((4x-3)+(2x+5)=4x-3+2x+5=6x+2\)

\((-5p+9)-(8p-2)=-5p+9+-8p+2=-13p+11\)

\(-9(6x-2y-7)=-54x+18y+63\)

\((-6p-3)(2q-8)=-12pq+48p-6q+24\)

\((5a+7)(-9a+2)=-45a^2+10a-63a+14=-45a^2-53a+14\)

\((x-4)(x+6)=x^2+6x-4x-24=x^2+2x-24\)

\((a+8)^2=a^2+16a+64\)

\((2p-3)^2=4p^2-12p+9\)

\((-9x-7y)^2=81x^2+126xy+49y^2\)

\((a+8)(a-2)(a+6)=(a+8)(a^2+4a-12)=a^3+4a^2-12a+8a^2+32a-96=a^3+12a^2+20a-96\)

\(x(x+8)(x+5)=x(x^2+13x+40)=x^3+13x^2+40x\)

\((-9a+4b)(-9a-4b)=81a^2-16b^2\)

\((-9p+7)(-9p-7)=81p^2-49\)

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