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Polynomials — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsPolynomials1 Mark
Question
Which of the following expression are polynomials? $\frac{1}{5\text{x}^{-2}}+5\text{x}+7$
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Answer

Polynomial, because the exponent of the variable of $\frac{1}{5\text{x}^{-2}}+5\text{x}+7=\frac{1}{5}\text{x}^2+5\text{x}+7,$ is a which is whole number.

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