Question

-15x^3 - 2. (2x - 3)^3 cuanto da?

Answer 1

-15x^3 - 2. (2x - 3)^3

$\left(2x-3\right)^3:\quad 8x^3-36x^2+54x-27\\\\=-15x^3-2\left(8x^3-36x^2+54x-27\right)\\\\\mathrm{Expandir}\:-2\left(8x^3-36x^2+54x-27\right):\quad -16x^3+72x^2-108x+54\\\\=-15x^3-16x^3+72x^2-108x+54\\\\\mathrm{Sumar\:elementos\:similares:}\:-15x^3-16x^3=-31x^3\\\\=-31x^3+72x^2-108x+54$