Question

If x = 1, y = -1 and z = 3 , find the value of

(i) 2x2 + y2 – 3z2

(ii) 3xyz – 2yz + 3xz2
​

Answer 1

Step-by-step explanation:

1)2x²+y²-3z²

2×1²+(-1)²-3(3)²

2×1+(-1)-3(9)

2-1-27

2-28=26

2) 3xyz-2yz+xz²

3×1×-1×3 -2×-1×3+3×1×(3)²

3×-1-3+3×9

-3-3+3×9

-6+3×9

-6+27

21

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