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Exponents are typically introduced in 5th grade, when students begin to explore concepts of powers and the rules of exponents. However, the depth of understanding and application of exponents can continue to develop throughout middle school and high school mathematics courses.
why the exponents can not be negative
When multiplying numbers with exponents, you add the exponents.
property of negative exponents
Positive exponents: an = a*a*a*...*a where there are n (>0) lots of a. Negative exponents: a-n = 1/(a*a*a*...*a) where there are n (>0) lots of a.