Question

Упростите выражение:
4c(−3c−7)(9c+5)

Answer 1

$\displaystyle \tt 4c(-3c-7)(9c+5)=(-12c^2-28c)(9c+5)=\\\\ \displaystyle \tt =-108c^3-60c^2-252c^2-140c=\bold{-108c^3-312c^2-140c}$