Question

Desarrolla (2r-3s)^3

Answer 1

Hola! 
Desarrolla (2r-3s)^3

$(2r-3s) ^3= \\ \\ (2r)^3+3*(2r)^2*(-3s)+3(2r)*(-3s)^2+(-3s)^3= \\ \\ 8r^3+3*4r^2*(-3s)+3(2r)*(9s^2) +(-27s^3)= \\ \\ 8r^3+(-36r^2*s)+54r*s^2-27s^3= \\ \\ \boxed{8r^3-36r^2s+54rs^2-27s^3}$

Espero que te sirva, salu2!!!!