## Quadratic Function (Graph)

### A quadratic function is a polynomial function of degree two

A quadratic function is a polynomial function of degree two. It can be written in the form:

f(x) = ax^2 + bx + c,

where a, b, and c are constants. The primary characteristic of a quadratic function is that it forms a parabola when graphed.

The graph of a quadratic function is a U-shaped curve called a parabola. The direction and shape of the parabola depend on the value of the leading coefficient, a. If a > 0, the parabola opens upwards, and if a < 0, the parabola opens downwards. The vertex of the parabola represents the minimum or maximum point of the function, depending on whether the parabola opens upwards or downwards. The x-coordinate of the vertex can be found using the formula x = -b / (2a), and the y-coordinate can be found by substituting the x-coordinate into the equation f(x). The vertex is also the axis of symmetry of the parabola, dividing it into two symmetric halves. The y-intercept of the quadratic function is the value of f(x) when x = 0, which can be found by substituting x = 0 into the equation f(x) = ax^2 + bx + c. If the quadratic function can be factored, the x-intercepts (also known as roots or solutions) can be found by setting f(x) = 0 and solving the resulting quadratic equation. The graph of a quadratic function can be used to analyze various real-world problems involving maximum or minimum values, projectile motion, optimization, and more. Overall, understanding quadratic functions and their graphs is essential in algebra and calculus, as they are fundamental concepts that are widely used in various mathematical applications.

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