Question

1 which of the following is not an irrational number
a) (2-√3) 2
b) (√2 +√ 3) 2
c) (√2-√3) (√2 + √3)
d) 27 √7​

Answer 1

Answer:

c

Step-by-step explanation:

use the operation

(a-b)(a+b)=a^2-b^2