Evaluate expression

If x=2, y=-5 and z=3 what is the value of x-2y

Result

v =  12

Solution:

x=2 y=5 z=3  v=x2 y=22 (5)=12x=2 \ \\ y=-5 \ \\ z=3 \ \\ \ \\ v=x-2 \cdot \ y=2-2 \cdot \ (-5)=12



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