Is the expression x^3*x^3*x^3 equivalent to x^3*3*3?
NO!!. In the first one, you add the exponents(x^3*x^3*x^3=x^(3+3+3)=x^9.
While in the second one, you multiply the exponents(x^3*3*3=x^(3x3x3)=x^27.
There is very big difference between the two. Make sure you understand it.