\(-4(3a+7b)=-12a-28b\)

\(-3(-5x-6)=15x+18\)

\(7(6x+4y+9)=42x+28y+63\)

\(4(-8p+6)+2(-9p+5)=-32p+24-18p+10=-50p+34\)

\(-8a(7a+2)=-56a^2-16a\)

\(5+(-2a+9)=5-2a+9=-2a+14\)

\(3-(8x+2)=3-8x-2=-8x+1\)

\((-3p-4)(-7q-8)=21pq+24p+28q+32\)

\((6x+3)(-8x-7)=-48x^2-42x-24x-21=-48x^2-66x-21\)

\((a+5)(a+9)=a^2+9a+5a+45=a^2+14a+45\)

\((5a+7)+(2a+8)=5a+7+2a+8=7a+15\)

\((-5p+8)-(-4p+7)=-5p+8+4p-7=-p+1\)

\((p-8)(p-5)(p+2)=(p-8)(p^2-3p-10)=p^3-3p^2-10p-8p^2+24p+80=p^3-11p^2+14p+80\)

\(x(x-8)(x+4)=x(x^2-4x-32)=x^3-4x^2-32x\)

\((a+6)^2=a^2+12a+36\)

\((7x-3)^2=49x^2-42x+9\)

\((-6a-9b)^2=36a^2+108ab+81b^2\)

\((-8x-6y)(-8x+6y)=64x^2-36y^2\)

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

\((x+7)(x-7)=x^2-49\)