Use the vertex form, , to determine the values of , , and .
Since the value of is positive, the parabola opens up.
Find the vertex .
Find , the distance from the vertex to the focus.
Find the distance from the vertex to a focus of the parabola by using the following formula.
Substitute the value of into the formula.
Combine and .
Multiply the numerator by the reciprocal of the denominator.
Multiply by .
Find the focus.
The focus of a parabola can be found by adding to the y-coordinate if the parabola opens up or down.
Substitute the known values of , , and into the formula and simplify.
Find the axis of symmetry by finding the line that passes through the vertex and the focus.
Find the Axis of Symmetry y=1/3(x+1)^2-3