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Question
Which of the following expression are polynomial? Justify your answer:
`1/(5x^-2) + 5x + 7`
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Solution
`1/(5x^-2) + 5x + 7 = 5x^2 + 5x + 7`
Here, the power of x are 2 and 1 respectively
2 and 1 both are whole numbers.
Hence, `1/(5x^-2) + 5x + 7` is a polynomial.
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