3xy+4xy+4zx-x²-y²-z² if X=2,y=3 and z=-2
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Step-by-step explanation:
3xy+4xy+4zx-x^2-y^2-z^2
= 7xy+4zx-x^2-y^2-z^2
= 7(2*3) -4(2*2) -(2)^2-(3)^2-(-(2))^2
= 7*6 -16 -4-9+4
= 42-16-4-9+4
=17
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