Question

(3-√7)(3+√7) rational or irrational

Answer 1

(3-√7)(3+7)=(3)^2+√7^2.....by identity

9-7=2.

Thus it is rational.

Answer 2

It is rational num.
Bcoz when we multiply its in form form (a-b)(a-b) that is a2 - b2.