Question

is the number (3 - √7) (3 + √7) rational or irrational​

Answer 1

Answer:

answer for the given problem is given

Answer 2

Answer:

(3 - √7) (3 + √7) = 2

Step-by-step explanation:

(3 - √7) (3 + √7) = 3^2 - (√7)^2

Using this identity

(a - b)    (a + b)   = a^2 - b^2

(3 - √7) (3 + √7) = 3^2 - (√7)^2

                           = 9 - 7

                           = 2

It is a rational number.