Hello 22upon7I'm assuming that the equation you're referring to is in the form . As an example, I'll use . So:

(1) The coordinates of the turning point are found as follows:

- Differentiate, and find the value of for which
- Substitute this value of in the original equation to find the value of

So:

when

and

So the turning point is , and it is a minimum since .

(2) The equation of the line of symmetry is simply the line through the turning point parallel to the -axis.

In this example, then, this is .

(3) The -axis intercepts are the values of for which

So: when

or

So the intercepts are and .

Grandad