Question

(2-√2)(2+√2) is it rational or irrational

Answer 1

Answer:

(2-√2)(2+√2)

we know,

(a-b)(a+)=a²-b²

→2²-(√2)²

=4-2=2

2 is a rational.

so (2-√2)(2+√2) is also a rational.