if k= 2^x+2^x+2^x then (k^3)/3 is equal to?

Question

If k= 2x+ 2^x +2^x then k³/3 is equal to ?

Answer 1

k = 2^x + 2^x + 2^x = 3(2^x)

k³/3 = {3(2^x)}³ /3 = 27(2^3x)/3 = 9(2^3x)