Question

2x2 − 2z4 + y2 − x2 + z4 if x = −4, y = 3, and z = 2.

Answer 1

Substitute the given figures for x, y and z into the expression. So:
2(-4)2 - 2(2)4 + (3)2 - (-4)2 + (2)4

Answer 2

Now expand the brackets.
2 x -4 =
2 x 2 =

Try the others