Question

Which of the following is not a rational number?

(a) -2⁄3
(b) 2√5-√5
(c) √9-3
(d) √18÷√2

Answer 1

Answer:

answer is

option b

$2 \sqrt{5} - \sqrt{5} = \sqrt{5 } \\ \\ \sqrt{5} \: is \: an \: irrational \: number$

Answer 2

Answer:

B

2√5-√5=√5(2-1)=√5

remaining value of √5 not a perfect so it's