\(3(-7a+5b)=-21a+15b\)

\(-4(8p+7)=-32p-28\)

\(4(8x-2y-5)=32x-8y-20\)

\(2(-6a-7)+3(8a-9)=-12a-14+24a-27=12a-41\)

\(2x(9x-4)=18x^2-8x\)

\(-2+(-8p-4)=-2-8p-4=-8p-6\)

\(7-(-5a-8)=7+5a+8=5a+15\)

\((-4x-3)(-2y-8)=8xy+32x+6y+24\)

\((-8x-4)(2x-3)=-16x^2+24x-8x+12=-16x^2+16x+12\)

\((a-8)(a+2)=a^2+2a-8a-16=a^2-6a-16\)

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

\((3p+8)-(7p+2)=3p+8+-7p-2=-4p+6\)

\((a+2)(a+9)(a-8)=(a+2)(a^2+a-72)=a^3+a^2-72a+2a^2+2a-144=a^3+3a^2-70a-144\)

\(x(x-2)(x-3)=x(x^2-5x+6)=x^3-5x^2+6x\)

\((p-4)^2=p^2-8p+16\)

\((-4x-9)^2=16x^2+72x+81\)

\((8a-4b)^2=64a^2-64ab+16b^2\)

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

\((3x-9)(3x+9)=9x^2-81\)

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