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Which of the following is a quadratic polynomial in \(x\)?

Answer and explanation

Correct answer: \(4x^2-3x+6\)

In \(4x^2-3x+6\), the highest power of \(x\) is 2, and every exponent of \(x\) is a non-negative integer. Hence, it is a quadratic polynomial in \(x\). \(x^3-2x+1\) has degree 3, so it is cubic. \(5x+\frac{2}{x}\) contains \(x^{-1}\), while \(\sqrt{x}+x\) contains \(x^{1/2}\); therefore, neither is a polynomial. Exam tip: in a polynomial, variable exponents must be non-negative integers such as 0, 1, 2, or 3.

Related tags

Quadratic PolynomialPolynomial DegreeAlgebraic ExpressionsExponentsClass 9 MathematicsQuadratic ExpressionsExploring Algebraic IdentitiesMathematics

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