Find the line of symmetry of y = x2 + 2x with 3 steps.
- Find the vertex, which is the lowest or highest point of a parabola. Hint: The line of symmetry touches the parabola at the vertex. (-1,-1)
- What is the x-value of the vertex? -1
- The line of symmetry is x = -1
Hint: The line of symmetry (for any quadratic function) is always x = n because it is always a vertical line.