Question

please explain and answer no wrong answer ​

Answer 1

Answer:

u have to replace the variable by the value given in the question

Step-by-step explanation:

1) 3x - 2y + 4z

3×1 - 2×2 + 4×5

3 - 4 + 20

-1 + 20

+19

2) xy + yz - zx

1×2 + 2×5 - 5×1

2 + 10 - 5

12 -5

7

3) x² + y² + z²

1² + 2² + 5²

1 + 4 + 25

5+ 25

30