Question

which of the following is not irrational 'option is (A) (3+root7)(B) (3-root7) (C) (3+root7)(3-root7) (D) 3root7​

Answer 1

Answer:

option (c)..i.e,

(3+√7)(3-√7)

Answer 2

Answer:

C

(3 + root 7) (3 - root 7) = (3)2 - (root 7)2

= 9 - 7

= 2

therefore option C is not irrational, it is rational