\(-7(9a+4b)=-63a-28b\)

\(-8+(-6x-4)=-8-6x-4=-6x-12\)

\(-4-(-9a-7)=-4+9a+7=9a+3\)

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

\(4(-6p+5)+3(2p-8)=-24p+20+6p-24=-18p-4\)

\(-6a(4a-7)=-24a^2+42a\)

\((-3x-4)+(-9x+7)=-3x-4-9x+7=-12x+3\)

\((3p+5)-(-4p+7)=3p+5+4p-7=7p-2\)

\(-9(-7a-6b+3)=63a+54b-27\)

\((-7x-5)(6y-2)=-42xy+14x-30y+10\)

\((9p+2)(6p-8)=54p^2-72p+12p-16=54p^2-60p-16\)

\((x-4)(x-8)=x^2-8x-4x+32=x^2-12x+32\)

\((a-7)^2=a^2-14a+49\)

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

\((-5a+6b)^2=25a^2-60ab+36b^2\)

\((x+9)(x-6)(x-4)=(x+9)(x^2-10x+24)=x^3-10x^2+24x+9x^2-90x+216=x^3-x^2-66x+216\)

\(a(a-7)(a+5)=a(a^2-2a-35)=a^3-2a^2-35a\)

\((2a-8b)(2a+8b)=4a^2-64b^2\)

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

\((p-2)(p+2)=p^2-4\)