Question

(iii)
4xyz - 2xy + 3xyz when x = -1, y = 2 and z= 1.
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Answer 1

Answer:

-10 is the answer

I hope it helps you

Answer 2

4(-1)(2)(1) - 2(-1)(2) + 3(-1)(2)(1)

-8 + 5 - 6

-3-6

-9