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Zeroes of a Polynomial

State whether...

Question

State whether following expression is polynomial or not:
$5 a^{- 2} + \sqrt{a + 4}$ ?

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Solution

A polynomial is an expression consisting of variables and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents.
$5 a^{- 2} + \sqrt{a + 4}$ is a polynomial.

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