Question

Which of the following numbers is irrational?

A. 2/3
B. -√81
C. 5.76262...
D. √2

Answer 1

Answer: options C and D

Explanation:

An Irrational Number is a real number that cannot be written as a simple fraction.

A . 2/3 is a rational number because it is a fraction

B . -
`√(81)` = -9 which could be written as -9/1 , so it is a rational number

C. 5.76262... is irrational because the decimal has no end point

D.
`√(2)` is a common example of irrational number , because finding the square root of 2 is also continuous .

Therefore , options C and D are irrational