\(-3(7a-5b)=-21a+15b\)

\(4+(9a-3)=4+9a-3=9a+1\)

\(-8-(-5x+6)=-8+5x-6=5x-14\)

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

\(-4(8p-7)+2(-3p-6)=-32p+28-6p-12=-38p+16\)

\(5a(-4a-8)=-20a^2-40a\)

\((7x-3)+(9x+6)=7x-3+9x+6=16x+3\)

\((-6p-4)-(9p-8)=-6p-4+-9p+8=-15p+4\)

\(3(-8p-6q+4)=-24p-18q+12\)

\((7a-2)(4b+8)=28ab+56a-8b-16\)

\((-4x-6)(-9x+5)=36x^2-20x+54x-30=36x^2+34x-30\)

\((a-5)(a+8)=a^2+8a-5a-40=a^2+3a-40\)

\((x+4)^2=x^2+8x+16\)

\((6x-8)^2=36x^2-96x+64\)

\((-8x-4y)^2=64x^2+64xy+16y^2\)

\((a-3)(a+4)(a+7)=(a-3)(a^2+11a+28)=a^3+11a^2+28a-3a^2-33a-84=a^3+8a^2-5a-84\)

\(x(x-9)(x+7)=x(x^2-2x-63)=x^3-2x^2-63x\)

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

\((-9a-3)(-9a+3)=81a^2-9\)

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