Question

(d) 1
► Answer
3. Which of the following is not irrational?
(a) (2-√3)2
(b) (√2 +√13)2
(C) (√2-√3) (√2 +√3)
(0) 2√7\7
​

Answer 1

C) (√2-√3) (√2+√3)

using identity, (a²-b²)= (a-b) (a+b),

= [(√2)²-(√3)²]

=2-3

= -1

and -1 is not irrational.

.

.

hope it helps...