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y=-4
z=4:
*x-y+z
(-2)-(-4)+(4)
-2+4+4
-2+8
+6
*¨3x+z-y
3(-2)+(4)-(-4)
-6+4+4
-6+8
2
*2xz-3xy+4
2(-2)(4) - 3(-2)(-4) +4
-16 - 24 + 4
-40 + 4
-36
*x ala 2-y ala2-z ala 2
-4 -16 - 16
-36