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Edvard Larouge
because its true...? 9^0= 1, 6^0=1, etc.
It wasn't necessary to 'create' any rules. They follow logically from the definition of exponents.
Because negative exponents doesn't exist in our world. And thus, can only be explained with 0. Hope that answered you question. *WIDE SMILEY FACE!*
you do not do anything when you add numbers with exponents. you just figure out the answer. it is only if you multiply numbers with exponents, where you add the exponents..