Which of the following expressions is a polynomial in one variable?

Foundation

Mathematics Foundation

types of polynomial

Question

$3 \sqrt{x} + \frac{2}{\sqrt{x}} + 5$

$x^{10} + y^{5} + 8$

$\sqrt{2} x^{2} - \sqrt{3} x + 6$

$x + \frac{2}{x} + 3$

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For polynomial in one variable, exponent of variable in each term should be a whole number.