\(7(-6a-4b)=-42a-28b\)

\(-5(-4x+8)=20x-40\)

\(4(-2x-5y-3)=-8x-20y-12\)

\(-2(5p+6)+3(8p+9)=-10p-12+24p+27=14p+15\)

\(9a(7a-3)=63a^2-27a\)

\(9+(-3a+4)=9-3a+4=-3a+13\)

\(6-(7a-3)=6-7a+3=-7a+9\)

\((5x-9)(7y+8)=35xy+40x-63y-72\)

\((-5x+6)(-7x-8)=35x^2+40x-42x-48=35x^2-2x-48\)

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

\((-4a-7)+(-2a-6)=-4a-7-2a-6=-6a-13\)

\((-2x+6)-(-9x+5)=-2x+6+9x-5=7x+1\)

\((a+7)(a-6)(a-8)=(a+7)(a^2-14a+48)=a^3-14a^2+48a+7a^2-98a+336=a^3-7a^2-50a+336\)

\(p(p-7)(p-3)=p(p^2-10p+21)=p^3-10p^2+21p\)

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

\((-7x-5)^2=49x^2+70x+25\)

\((-8x-2y)^2=64x^2+32xy+4y^2\)

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

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

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