X to the power of 3 minus 2y to the power of 2 minus 3x to the power of 3 plus z to the power of 4, if x=3, y=5, z = - 3

This would be much easier to understand if you write it in this format:

(x^3) - (2y^2) - (3x^3) + (z^4)

Now replace the variable with the values:

(3^3) - (2 * 5^2) - (3 * 3^3) + (-3^4)

Solve using order of operations:

(27) - (2 * 25) - (3 * 27) + (81) =

(27) - (50) - (81) + (81) =

-23 - (81) + (81) =

-104 + (81) =

-23

So the final answer is - 23.

3 to the power of 3 - 2 times 5 to the power of 2 - 3 time 3 to the power of 3 plus - 3 to the power of 4

9 - 2 times 25 - 3 time 9 + (-81)

9 - 50 - 27 - 81

-41 - 27 - 81

-68 - 81

-149