Question

Evaluate each of the following expressions for x = -2, y=-1, z = 3:
+
+
(ii) x2 + y2 + z2 – xy - yz - zx​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

=> x2 + y2 + z2 - xy - yz - xx

=> -2(2) + [-1(2)] + 3(2) - [-2(-1)] - (-1)3 - 3(-2)

=> -4 + (-2) + 6 - 2 - (-3) - (-6)

=> -4 -2 +6 -2 +3 +6

=> 7