Question

which of the following is not an irrational number? (a)5+V5 (b)(2+V5)V5 (c)(2+V5)(2-V5)(d)5V5​

Answer 1

Answer:

Option c

Step-by-step explanation:

We can simplify (a+b)(a-b) as (a^2-b^2)

(2^2 - √5^2)= 4-5=-1

all other values will give irrational numbers

hence c is the right option