Question

How do you find the y intercept, axis of symmetry and the vertex to graph the function `f(x)=x^2-9x+9`?

Answer 1

Complete the square

Explanation:

If you complete the square, you will get `f(x)=(x-9/2)^2-45/4`. `f(0)` will give you 9 (the y intercept), `9/2` will be the x coordinate of the vertex and `-45/4` will be the y coordinate of the vertex. The axis of symmetry will be through the vertex at x = `9/2`