You can put this solution on YOUR website! (1) It's a function. You can call it f(x), or
a function of x.
That means that there is 1 and only 1 value of f(x)
for each value of x.
-------------------
If there were 2 possible values of f(x) for a certain x,
then it would be disqualified as a function.
------------------------------------
(2) It's a 2nd degree equation, also called a parabola
Here's the plot:
---------------
You can see that there are 2 x-crossings, called roots. That is a feature
of 2nd degree equations- 2 real roots. If there were no
x-crossings at all, then there would still be 2 roots,
but they would be imaginary.
---------------------------
Hope this helps
