1. `2x^2+3x+1`, find Determine expression(function) is a polynomial or not

Solution:
The Given Polynomial `=2x^2+3x+1`

`2x^2+3x+1` is a polynomial

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2. `x^(-5/2)+2x+1`, find Determine expression(function) is a polynomial or not

Solution:
The Given Polynomial `=x^(-5/2)+2x+1`

`=2x+1+1/(x^(5/2))`

In `1/(x^(5/2))` power is `(-5)/2`, is negative

`2x+1+1/(x^(5/2))` is not a polynomial