Question

1.Which of the following is not irrational?

(2 – √3)2
(√2 + √3)2
(√2 -√3)(√2 + √3)
2√7/7​

Answer 1

Answer:

2√7/7

Explanation:

because

I) 2(2-√3)=4-√6

Here √6 is irrational.

ii)2(√2-√3)=√4-√6

= √4=2

=√6=2.449448

Here also √6 is irrational.

so the answer is 2√7/7

here

2√7/7=2√1

=2×1=2