Can anyone tell me how can brackets change the sign of answer and how to solve them without calculator?

Hi

In the first case we have the operation : - 5 * 5 * 5 * 5 = - 625

In the second case we have a parenthesis so the operation is:

(-5) * (-5) * (-5) * (-5) = 625

If we multiply a negative by a positive it gives a negative value

A positive by a positive gives a positive value

A negative by a negative gives a positive value

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Got it, Thank you so much🤍