Final answer:
The expression 2 - 2√2 is an irrational number.
Step-by-step explanation:
The expression 2 - 2√2 is an irrational number.
An irrational number is a number that cannot be written as a fraction of two integers. In this case, the square root of 2 (√2) is irrational, and when multiplied by 2, it remains irrational. Subtracting an irrational number from a rational number does not change the nature of the result, so 2 - 2√2 is still irrational.