It is x-3 and the value of that expression depends on the value of x. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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IMPOSSIBLE
y = x2 is an (approximately) U shaped graph that is entirely above the x axis and is symmetric about the y axis. y = x3 is asymptotically negatively infinite when x is negatively infinite and positively infinite when x is positively infinite. It is symmetric about the line x+y=0.
x3
find x3+y2 if x=4 and y=3 ( 4*4*4)+(3*3) 64 +9 =73
2x2-y2