Find x3 - 2y2 - 3x3 + z4 if x = 3, y = 5, and z = - 3

The answer is - 49

First you plug in your numbers following the letter

After plugging it in you get the equation

3•3 - (2•5•2) - (3•3•3) + - 3•4

Simplified as

9-20-27-12

After doing this you get - 49

3 (3) - 2 (5) 2-3 (3) 3 + (-3) 4=

9-20-27+-12

-50

I think I solved the problem correctly.