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Which of the following is not a linear inequality?

Answer and explanation

Correct answer: x² − 4 < 0

The governing concept is the degree of the variable. A linear inequality has the variable only to the first power, with no products of variables, roots involving the variable, or higher powers. Options A, B, and D are linear because x has degree one. In option C, the term x² has degree two, so x² − 4 < 0 is a quadratic, not a linear, inequality. Therefore option C is correct. The numerical constants and inequality signs do not determine linearity by themselves; the exponent of the variable does. Even though option C can be solved as an inequality, its form is nonlinear. This distinction is important before selecting an algebraic or graphical method.

Related tags

Linear InequalitiesDegreeNonlinear ExpressionIntroduction To InequalitiesMathematicsClass 11 Mcq

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