use euclid's divison lemma to show that cube of every positive integer is of the the form 9m or 9m+1 or 9m +8
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let us start with a smallest cube no i.e 8
8=9*0+8 i.e 9m+8
let us take with next cube no i.e 27
27=9*3 i.e 9m
let us take next cube no that is 64
64=9*7+1 i.e 9m+1
thus the cube of any integer is in the form of 9m,9m+8,9m+1
8=9*0+8 i.e 9m+8
let us take with next cube no i.e 27
27=9*3 i.e 9m
let us take next cube no that is 64
64=9*7+1 i.e 9m+1
thus the cube of any integer is in the form of 9m,9m+8,9m+1
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