\(2(-7a-5b)=-14a-10b\)

\(9+(-4a+3)=9-4a+3=-4a+12\)

\(-3-(-8x+9)=-3+8x-9=8x-12\)

\(-8(-2x+4)=16x-32\)

\(3(-9p+6)+4(8p-2)=-27p+18+32p-8=5p+10\)

\(-9a(5a+8)=-45a^2-72a\)

\((-4p+7)+(-8p-5)=-4p+7-8p-5=-12p+2\)

\((-5x-4)-(-6x+9)=-5x-4+6x-9=x-13\)

\(2(-9a+3b+5)=-18a+6b+10\)

\((-7p+8)(9q+6)=-63pq-42p+72q+48\)

\((-2a+8)(4a+9)=-8a^2-18a+32a+72=-8a^2+14a+72\)

\((x+6)(x+9)=x^2+9x+6x+54=x^2+15x+54\)

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

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

\((8p-9q)^2=64p^2-144pq+81q^2\)

\((p+6)(p-3)(p-9)=(p+6)(p^2-12p+27)=p^3-12p^2+27p+6p^2-72p+162=p^3-6p^2-45p+162\)

\(x(x-3)(x-8)=x(x^2-11x+24)=x^3-11x^2+24x\)

\((7a+6b)(7a-6b)=49a^2-36b^2\)

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

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