Question

if x=3,y=1 and z=-4,find the values of the following expressions:

(1)x2+y2+z2+2xy+2yz+2
(2)x3+y3+z3-3xyz
(3)4x2+y2+z2-4xy-2yz+4zx
(4)x2+4y2+z2/4-4xy+2yz-xz

This is the answer of the questions:
(1)0
(2)0
(3)1
(4)9

By explain you do. Ok​

Answer 1

Answer:

These may help you

1. 0
2. 0
3. 1
4. 9

Thank you

Answer 2

Answer:

These may help you

0

0

1

9

Thank you