Question

If x= -1,y=2andz=4,Evaluate xy-y+z2= ?

Answer 1

xy-y+2z= -1(2)-2+2(4)
=-2-2+8
=-4+8
=4
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Answer 2

$- 1 \times 2 - 2 + 4 \times 2 \\ - 2 - 2 + 8 \\ - 4 + 8 \\ = 4$