Question

1. Is the number (3+ √7)(3- √7) rational or irrational?​

Answer 1

Answer:

It is rational number.

Step-by-step explanation:

if you solve this,

(3)^2-(root7)^2

then coming answer is 2

Answer 2

Question:- Is (3+ √7)(3- √7) rational or irrational?

To Check whether it is rational or Irrational we have to first simplify it.

To Check whether it is rational or Irrational we have to first simplify it. Since the number is in the form (a + b) (a - b) we have to use the identity and write it as a^2 - b ^2

Therefore, (3)^2 - ${( \sqrt{7)} }^{2}$

= 9 - 7

= 2

Therefore, Since the answer is 2 we can say that it is a rational number.