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Math 90 4.1 "Natural-Number Exponents" Objectives: * Identify bases and exponents. * Use the product and power rules for exponents. * Use the quotient rule for exponents. Identify Bases and Exponents Natural-Number Exponents: A natural-number exponent indicates how many times its base is to be used as a factor. For any number x and any natural number n; : Example 1: (Identifying bases and exponents) Identify the base and exponent in each expression. 2 a) ( 3) 3 32 b) c) (5x) Use the Product and Power Rules for Exponents Product Rule for Exponents: For any real number x and any natural numbers m and n; : (To multiply exponential expressions with the same base, keep the common base and add the exponents.) Example 2: (Product rule) Simplify each expression. a) 8x4 x3 WARNING!!! b) a2 b3 a3 b4 Examples of common errors associated with the product rule: 32 34 6= 98 Power Rule for Exponents: For any real number x and any natural numbers m and n; 23 52 6= 105 : (To raise an exponential expression to a power, keep the base and multiply the exponents.) Example 3: (Power rule) Simplify each expression. a) 32 2 b) x2 x3 6 c) x2 4 x3 2 Power of a Product and Quotient: For any real numbers x and y, and any natural number n; and where y 6= 0: (To raise a product to a power, raise each factor of the product to that power. To raise a quotient to a power, raise the numerator and denominator to that power.) Page: 1 Notes by Bibiana Lopez Introductory Algebra by Marvin L. Bittinger Example 4: 4.1 (Product and Quotient rule) Simplify each expression. a) x2 y 3 b) x y2 4 c) 6x3 5y 4 2 Use the Quotient Rule for Exponents Quotient Rule for Exponents: To divide exponential expressions with the same base, keep the common base and subtract the exponents. For any nonzero number x and any integers m and n; Example 5: (Quotient rule) Simplify each expression. Write answers using positive exponents. a5 x4 x3 a) 3 b) a x5 c) x5 y 8 7x2 y 4 Simplify Quotients Raised to Negative Powers Negative Exponents and Reciprocals: A fraction raised to a power is equal to the reciprocal of the fraction raised to the opposite power. For any nonzero real numbers x and y, and any integer n, Example 6: (Negative exponents and reciprocals) Simplify each expression. Write answers using positive exponents. 3 y2 a 2 b3 a) b) x3 a2 a3 b4 Page: 2 3 Notes by Bibiana Lopez