Which of the following expressions is a polynomial?

Foundation

Mathematics Foundation

types of polynomial

Question

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

$\sqrt{x} - 1$

$\frac{x - 1}{x + 1}$

$x^{2} - \frac{2}{x^{2}} + 5$

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