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Check whether 7sqrt(5),7/(sqrt(5)),sqrt(...

Check whether `7sqrt(5),7/(sqrt(5)),sqrt(2)+21 ,pi-2`are irrational numbers or not.

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(i) `7sqrt5 = 7* 2.236...` so, irrational
(ii) `7/sqrt5 = 7/(2.236.) ` irrational
(iii)` sqrt2 + 21 = 22.41.... +21` irrational
(iv) `pi-2 = 3.14.... - 2` irrational
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