Question

which of the following is not ir rational?
3+root7
2+root7
4*root7
(3+root7) (3-root7)​

Answer 1

Answer:

(3+√7)(3-√7)

Step-by-step explanation:

by using identity ; a^2-b^2=(a+b)(a-b)

=(3)^2-(√7)^2

=9-7

=2

hence 2 is rational number.