Thank you for the quick reply!

From my understanding, m is the first derivative of the original equation,

Mr F says: Correct.
m is usually how you calculate the slope in the form of [tex]m=\frac{y2-y1}{x2-x1}[\math] right?

Mr F says: Correct. That's where equation (3) comes from.
In your response, b is the original equation, so what is a?

Mr F says: (a, b) is the point on the curve that you're trying to find.
And do you use the quadratic formula to calculate a and b?

Mr F says: If I was you, I'd substitute (1) into (3) and then equate (2) and (3). Now solve the resulting equation for a. etc.
Sorry if this seems an obvious question, but I really just don't get it