Question

If a/b = 2/3, find the value of
     (a³ - b³)
    -----------
         b³​

Answer 1

If a/b=2/3 then find the value of a³-b³/b³?

As no brackets have been shown: a³-b³/b³

= a^3 -1

= (2b/3)^3 -1

= (8b^3–27)/27.