Question

28^3+(-15)^3+(-13)^3

Answer 1

=21952-3375-2197 (cubed negative number is equals to negative)

=16380

Answer 2

(28)^3 + ( -15 )^3 + ( -13) ^3


let a = 28 ,b = -15 and
c = -13

if a + b + c = 0

28+ ( -15) + (-13)

= 28- 28 = 0

then , a^3 + b^3 + c^3 = 3abc

hence,

(28)^3 + (-15)^3 + (-13)^3 = 3(28)(-15)(-13)

= 16380