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Quadratic Equations

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What is the quadratic formula?
The quadratic formula to find the roots of the equation $ax^2 + bx + c = 0$ is $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$.
What is the axis of symmetry in a quadratic function?
The axis of symmetry for a parabola described by $y = ax^2 + bx + c$ is the vertical line $x = -\frac{b}{2a}$.
What is the vertex of a parabola?
The vertex of a parabola represented by $y = ax^2 + bx + c$ is the point $(h, k)$ where $h = -\frac{b}{2a}$ and $k = f(h)$.
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