Question

Identify (3+√2) (3–√2) is rational or irrational number.​

Answer 1

Identify (3+√2) (3–√2) is rational or irrational number.​

Answer 2

(3+√2)(3-√2)

(a+b)(a-b) = a^2-b^2

3^2 - √2^2

9-2 = 7

7 is a rational number

Hence,

(3+√2)(3-√2) is a rational number.