Question 1183866
<pre>
I agree with everything robertb said, except 

"tangent to the x-axis"

It isn't tangent to the x-axis.  It is ABOVE the x axis, tho.

Substitute a=b=c=1 and x<sup>2</sup>-x+1 ≥ 0.  That quadratic is
ABOVE, but not tangent to, the x-axis.

Edwin</pre>