Exemplar Exercise Problems IV — task. Mathematics CBSE, Class 9.

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Which of the following expressions are polynomials? Justify your answer:

1.

$5\frac{1}{x^{-2}}+5x+7$ is

2.

$\frac{(x - 2) (x - 4)}{x}$ is

3.

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

Answer variants:

a polynomial

not a polynomial

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