Are the following statements true or false? Correct the false ones by changing the right-hand side and write the statements again.

(3) (–7)² = –49

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Solution

(–7)² = –49
Consider (–7)² = (–7) × (–7)
= 49 (Product of negative sign is positive if multiplied for an even number of times)
∴ (–7)² = –49 is a false statement.
Correct statement is (–7)² = 49.

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