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In a linear inequality the variable is only present raised to the first power (which is usually not explicitly shown). In a quadratic the square of the variable is present (or implied).

The square can be implied in an inequality such as x + 1/x < 6 (x not 0)

This is equivalent to x2 - 6x + 1 < 0

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Q: How do you tell a linear inequality from a quadratic inequality?
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A linear inequality is all of one side of a plane. A quadratic inequality is either the inside of a parabola or the outside.


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