216 x³ + 1 / 125.

Hello student,
Please find the answer to your question below
Given 216x³+1/125
It can be simplified as (6x)³+(1/5)³............(1)
we know a³+b³=(a+b)(a²-ab+b²)
so by expanding equation (1) we get
where a=6x and b=1/5
so (6x)³+(1/5)³=(6x+1/5)(36x²-(6x/5)+1/25)