f(x) is -4, g(x) is 4, h(x) is 1.
For the f(x), it is in vertex form, which is a(x-h)^2+k. The a.o.s. Is the opposite of h, therefore, it’s -4.
For the g(x), it is in standard form, which is ax^2 + bx + c, you can use the formula -b/2a to find the a.o.s. So, -(-16)/2(2) is 4.
For the h(x), just look at the graph and find where the middle of the parabola is. When you go to 1 on the x-axis and draw a vertical line, it cuts the parabola into half. 1 is the a.o.s.
Note: f(x), g(x), and h(x) can also be 0 or y.
