Question

A cube plus A minus 3 a square minus 3

Answer 1

Question:

$a ^{3} + a - 3a^{2} - 3$

First we will write it properly. And then take 3 on the right side.

${a}^{3} - 3a^{2} + a = 3$

You did not mention what to do - factorize, etc. but you've got the general form of the expression.