Question

Which of the following is an irrational number?

A
64−−√

B
90−−√

C
25−−√

D
169−−−√
please help

Answer 1

sqrt(90) is irrational

Explanation:

sqrt(64) = 8

sqrt(90) = 3 sqrt(10)

sqrt(25) =5

sqrt(169)=13

The only one that is not simplified to an integer is sqrt(90)

sqrt(90) is irrational