Practice Problem - Check if Polynomial

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Which of the following expressions are polynomials? Justify your answer. (i) 8 (ii) √3 𝑥^2−2𝑥 (iii) 1 – √5 𝑥 (iv) 1/(5𝑥^(−2) )+5𝑥+7 (v) ((𝑥 − 2) (𝑥 − 4))/𝑥 (vi) 1/(𝑥 + 1) (vii) 1/7 𝑎^3−2/√3 𝑎^2+4𝑎−7 (viii) 1/2𝑥