Which number is NOT real?
Show answer & explanation
Correct answer: B
Explanation
Given:
Options – 4, 1, √7, √-7, 1/√7, -√7
The square root of a negative number is not a real number.
√7 → real
1/√7 → real
-√7 → real
√-7 → square root of a negative number, hence not real.