Question

Please help for a medal :)
First off: I know how to solve these problems, i'm just terrible at it. Please help me solve these two.

Answer 1

\[2x^2 - 2z^4 + y^2 - x^2 + z^4\] if X = -4, Y = 3, Z = 2

Answer 2

\[x^3 - 2y^2 - 3x^3 + z^4\] if x = 3, y = 5, and z = -3.

Answer 3

Thanks so much!