Question

is the number (2-√3) (2+√3) rational or irrational​

Answer 1

Rational
(2-√3)(2+√3)
=(2)$^2$-(√3)$^2$
$\since [a^2-b^2=(a+b)(a-b)]$
=4-3=1 = Rational

Answer 2

Answer:

(2-√3) (2+√3) is  rational