Question

without actually calculating the cubes find the value of the following:

(-20)cube + (38)cube +(-18)cube

Answer 1

Step-by-step explanation:

using the identity that if a+ b+c = 0 then a cube + b cube + c cube = 3abc

so in this ques.

a= -20

b=38

c=-18

if we add these we will get 0 so the sum of their cube will be

3×-20×38×-18

= 41040

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Answer 2

Answer:

(-20^2) +(-38^2) +(-18^2) = -2168