Every quadratic function has a U-shaped graph called a parabola. The parabola opens up if the value of a is positive. The parabola opens down if the value of a is negative.
The Vertex is the highest or lowest point on a parabola. The vertical line passing through the vertex that divides the parabola in two symmetric parts is called the axis of symmetry.
Sketch the graph of y= (x)2 - 2x - 3
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