Why a negative times a negative is a positive
5:47
Why a negative times a negative is a positive
Jun 22, 2012
Khan AcademySal Khan
Quick algebra tip about squaring negatives. (-3)² means square the whole number in parentheses, so (-3)² = 9. -3² means take the square of 3 first, then keep the negative, so -3² = -9. Parentheses change the meaning. Use this rule on quizzes so you do not lose points on exponent questions. #algebra #mathtips
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