By M. Bourne
A parabolic dish antenna uses the quadratic equation
Introduction to Quadratic Equations
Quadratic equations are used in many areas of science and engineering. The path of a projectile (e.g. a cannon ball) is (almost) parabolic, and we use a quadratic equation to find out where the projectile is going to hit. Also, parabolic antennas are another application.
Real mathematics is about modelling situations that occur naturally, and using the model to understand what is happening, or maybe to predict what will happen in future.
The quadratic equation is often used in modelling because it is a beautifully simple curve.
Related IntMath topics
The parabola is closely related to the quadratic equation
Complex Numbers arise out of the problem where we cannot find the square root of a negative number.
We can see quadratic equations used in integration by partial fractions
Curve sketching (an application of differentiation)
Solving second-order homogeneous linear differential equations
Finding the intersection point of two circles
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