Posted by **Key** on Monday, May 6, 2013 at 2:19am.

Are all quadratics of the form y = ax^2+bx +c and y = -ax^2+bx +c functions? Explain your answer.

- math -
**Steve**, Monday, May 6, 2013 at 11:27am
No, all quadratics in x and y are of the form

ax^2 + bxy + cy^2 + dx + ey + f = 0

Now, if you want quadratics where y is expressed as a function of x, then all are of the form

y = ax^2 + bx + c

where a,b,c can be positive or negative. There's no need for -ax^2 + bx + c.

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