Question

please help in this ​

Answer 1

(2+√3) (2-√3) (5+√2) (5-√2)

using the identity a^2- b^2 = (a+b) (a-b)

(4-3) (25-2)

= 1*23 = 23

Answer 2

Step-by-step explanation:

To Show

(2+√3)(2-√3)(5+√2)(5-√2)

formula (a+b)(a-b) = a²-b²

(2+√3)(2-√3) = 2²-√3² = 4-3 = 1

(5+√2)(5-√2) = 5²-√2² = 25-2 = 23

1*23 = 23

23 is a rational number

hence showed