12b^8/ 3b^4=
Laws of exponents: xa*xb = xa+b xa/xb = xa-b (xa)b = xab x-a = 1/xa x1/a = ath root of x 12b^8/ 3b^4 = (12/3)b^8/b^4 = 4b8-4 = 4b4
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