# Find which of the variables x, y, z and u represent rational numbers and which irrational numbers:(i) x2 = 5 (ii) y2 = 9(iii) z2 = .04 (iv) 𝑢2 = 17/4

(i) x2 = 5

On taking square root on both sides, we get

x = ± √5

So, x is an irrational number.

(ii) y2 = 9

On taking square root on both sides, we get

y = ± 3

So, y is a rational number.

(iii) z2 = .04

On taking square root on both sides, we get

z = ± 0.2

So, z is a rational number. On taking square root on both sides, we get So, u is an irrational number because 17 is irrational.

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