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

Answer and explanation

Correct answer: \(\sqrt{2}x-\frac{3}{5}\)

In \(\sqrt{2}x-\frac{3}{5}\), the highest power of the variable \(x\) is 1, and \(\sqrt{2}\) is a real coefficient. Hence, it is a linear polynomial in \(x\). \(x^2-1\) is quadratic, while \(\frac{1}{x}+2\) has power \(-1\) of \(x\) and \(\sqrt{x}+1\) has power \(\frac{1}{2}\); therefore, these are not polynomials. Exam tip: powers of a variable in a polynomial must be non-negative integers such as 0, 1, 2, ... .

Related tags

Linear PolynomialsPolynomial DegreeReal CoefficientsAlgebraic ExpressionsClass 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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