Question

Which of the following is not an irrational number ?
(a) 5+✓5
(b) (2+✓5)✓5
(c) (2+✓5)(2-✓5)
(d) 5✓5 ​

Answer 1

Answer:

(c) is not an irrational number

Answer 2

option (c)

Step-by-step explanation:

(2+√5)(2-√5)=2^2-5

=4-5=-1