Answer:
A number n squared is written as n² and n² = n × n. If n is an integer then n² is a perfect square. For example, 3 squared is written as 3² and 3² = 3 × 3 = 9. Nine is a perfect square.
Step-by-step explanation:
When an exponent expression is written with a positive value such a 4² it is easy for most anyone to understand this means 4 × 4 = 16 However, when it is written as a negative value without parentheses the meaning is ambiguous. It has a different meaning to different people. Different possible interpretations of -4²:
