How to solve quadratic functions

I understand how to solve quadratice equations, but what do you do if it is equal to f(x).  I am guessing that you set if equal to 0, but could anyone confirm?

f(x) = x^2 -6x +13. As an example. Have a great day

Step-by-step explanation:

the answer to the expression is 83

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.