Question

Without actually calculating the cubes, find the value of each of the following:
(1) (-12)3 + (7)^3+ (5)3
(ü) (28)3 + (-15)^3 +(-13)3​

Answer 1

Answer:

i) if a+b+c=0 then a^3+b^3+c^3=3abc

-12+7+5=0

3abc=3(-12×7×5)=-1260