\(-4(-2a-5b)=8a+20b\)

\(8(2x-3)=16x-24\)

\(-3(7p+9q+8)=-21p-27q-24\)

\(2(8a+5)-3(7a-9)=16a+10-21a+27=-5a+37\)

\(-9x(2x+6)=-18x^2-54x\)

\(-8+(-2p-4)=-8-2p-4=-2p-12\)

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

\((9a-4)(7b+8)=63ab+72a-28b-32\)

\((-7a+8)(-9a-2)=63a^2+14a-72a-16=63a^2-58a-16\)

\((x-4)(x-6)=x^2-6x-4x+24=x^2-10x+24\)

\((3a+7)+(9a+8)=3a+7+9a+8=12a+15\)

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

\((x-9)(x+4)(x+2)=(x-9)(x^2+6x+8)=x^3+6x^2+8x-9x^2-54x-72=x^3-3x^2-46x-72\)

\(p(p+4)(p-5)=p(p^2-p-20)=p^3-p^2-20p\)

\((a-9)^2=a^2-18a+81\)

\((6x+4)^2=36x^2+48x+16\)

\((5a+8b)^2=25a^2+80ab+64b^2\)

\((5p+7q)(5p-7q)=25p^2-49q^2\)

\((-6x-4)(-6x+4)=36x^2-16\)

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