Which of these functions represents a quadratic function and why? y=-x^2+16sqrtx-64 x=y^2-2y+4 -5+3y=-4 y=3x^2-5x+9

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Which of these functions represents a quadratic function and why? y=-x^2+16sqrtx-64 x=y^2-2y+4 -5+3y=-4 y=3x^2-5x+9

Mathematics
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its an interesting question... as they aren't all functions...
Yeah true
But which one is quadratic

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so do you know the general form for a quadratic..?
y=x^2+x-constant
well the general form is \[y = ax^2 + bx + c\]
I think that the last one is the quadratic function because reading it from right to left it goes downwards in value of x until it gets to the constant
so which equations fit this form...?
so that's good... but what about the 2nd one...?
Well I thin that it doesnt work because it starts with x= and y cannot be used as a quadratic equation?
the answer is y=3x^2-5x+9
Thanks I got it right and I understand:)
well it can start with anything you like and contain and variable you like... by the problem is the 2nd one is not a function... if you graphed it you would see something like this... |dw:1433713794806:dw| which fails the vertical line test for a function... I'd expect you know about that

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