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Using "^" for powers. A quadratic equation has a term like x squared (or whatever variable you are using squared). For example, 5x^2 + 3x - 7 = 0. The general form is ax^2 + bx + c = 0.

A linear equation uses only the first power of a variable; this power is usually not explicitly written. The general form is ax + b = 0; specific examples are 5x + 3 = 0, or x - 7 = 0.

The above assumes you use a single variable; linear and quadratic equations with several variables are also possible.

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