exam Maths Puzzle Numerical Ability

5sqrt8 plus sqrt98 - 2sqrt18

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exam Other Question

I am not clear about functions, so I need help figuring this out. Could someone please help?
Which of the following is not a function of x?
y=x^2+5x+3
y-3=6x
6x= -y^2+3
0=5x-y+1 3x + 17 - 5x = 12 - (6x + 3)