\(-7(-3a+4b)=21a-28b\)

\(5(3a+6)=15a+30\)

\(8(2p-3q+5)=16p-24q+40\)

\(-3(5x+8)+4(6x+7)=-15x-24+24x+28=9x+4\)

\(4x(6x+3)=24x^2+12x\)

\(2+(5x-7)=2+5x-7=5x-5\)

\(-8-(-6p-7)=-8+6p+7=6p-1\)

\((-8x+3)(9y+7)=-72xy-56x+27y+21\)

\((-5a+6)(-9a-2)=45a^2+10a-54a-12=45a^2-44a-12\)

\((a-3)(a-9)=a^2-9a-3a+27=a^2-12a+27\)

\((-9x-2)+(5x+3)=-9x-2+5x+3=-4x+1\)

\((-6p-4)-(3p-5)=-6p-4+-3p+5=-9p+1\)

\((a+8)(a-9)(a-2)=(a+8)(a^2-11a+18)=a^3-11a^2+18a+8a^2-88a+144=a^3-3a^2-70a+144\)

\(p(p+3)(p+8)=p(p^2+11p+24)=p^3+11p^2+24p\)

\((a+3)^2=a^2+6a+9\)

\((-2x+5)^2=4x^2-20x+25\)

\((-6x-5y)^2=36x^2+60xy+25y^2\)

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

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

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