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 only correct option​

Answer 1

Answer:

d)

Step-by-step explanation:

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Answer 2

Answer:

option c is not an irrational number

Step-by-step explanation:

2(2-√5)=4-2√5

√5(2-√5)=2√5-5

2√5-2√5=0

4-5=-1 is an irrational number