evaluate 2x4x2 in the mod 5 system
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-2-3=+7
If x=3 and y=2, 4xy = 4(3)(2) = 12(2) = 24
Evaluate x/y when x = 4 and y = 4. x/y = 4/4 = 1/1 = 1
Interpreting the question as "evaluate f(x) = -x2 + 5 for x = 4". This is the same as asking "what is f(4)". To evaluate f(4) just replace each instance of the x in the definition of f(x) by the number 4: f(4) = -42 + 5. The result is -11.
y=x2+3 x1=1 x2=2 y(x1) = 1*1+3 = 4 y(x2) = 2*2+3 = 7 x2/x1 = 2, While y2/y1 = 7/4 !=2, and thus the function is nonlinear.