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Which of the following is a quadratic expression in one variable?

Answer and explanation

Correct answer: 3x² - 5x + 2

A quadratic expression in one variable contains only one variable, with highest exponent 2. In 3x² - 5x + 2, x is the only variable and its highest power is 2, so it is quadratic. x³ + x is cubic because its degree is 3, while x + y² has two variables. Exam tip: first check the number of variables, then identify the highest exponent.

Related tags

Quadratic ExpressionsAlgebraic IdentitiesPolynomial DegreeOne VariableClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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