\(-2(-4a+5b)=8a-10b\)

\(-7+(-2p+9)=-7-2p+9=-2p+2\)

\(2-(-8x-7)=2+8x+7=8x+9\)

\(-8(-4x-3)=32x+24\)

\(2(3a-8)-4(-7a-9)=6a-16+28a+36=34a+20\)

\(5a(2a+3)=10a^2+15a\)

\((-7x+4)+(5x+9)=-7x+4+5x+9=-2x+13\)

\((-9x-2)-(6x+4)=-9x-2+-6x-4=-15x-6\)

\(9(6x-2y-8)=54x-18y-72\)

\((-3a-8)(6b-4)=-18ab+12a-48b+32\)

\((-4p-8)(-7p+6)=28p^2-24p+56p-48=28p^2+32p-48\)

\((x+9)(x+7)=x^2+7x+9x+63=x^2+16x+63\)

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

\((5x+3)^2=25x^2+30x+9\)

\((3p+5q)^2=9p^2+30pq+25q^2\)

\((p+2)(p-8)(p+3)=(p+2)(p^2-5p-24)=p^3-5p^2-24p+2p^2-10p-48=p^3-3p^2-34p-48\)

\(x(x+2)(x+5)=x(x^2+7x+10)=x^3+7x^2+10x\)

\((4a-5b)(4a+5b)=16a^2-25b^2\)

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

\((x-3)(x+3)=x^2-9\)