Simplifying Exponential Expressions Exponential Notation Base Exponent Base

Simplifying Exponential Expressions

Exponential Notation Base Exponent Base raised to an exponent Example: What is the base and exponent of the following expression? 2 is the 7 is the base exponent

Goal To write simplified statements that contain distinct bases, one whole number in the numerator and one in the denominator, and no negative exponents. Ex:

Multiplying Terms When we are multiplying terms, it is easiest to break the problem down into steps. First multiply the number parts of all the terms together. Then multiply the variable parts together. Examples: Only the z is squared 2. . = ( 4 -5 )( x x ) a. ( 4 x )( -5 x ) = -20 x b. (5 z 2)(3 z)(4 y) = (5. 2. 3. 4)(y. z. z) = 120 yz 2

Exploration Evaluate the following without a calculator: 34 = 81 33 = 27 32 = 1 9 ÷ 3 ÷ 3 3 = 3 Describe a pattern and find the answer for: ÷ 3 0 3 = 1

Zero Power 0 a =1 Anything to the zero power is one Can “a” equal zero? No. You can’t divide by 0.

Exploration Simplify: Use the definition of exponents to expand There are 7 “x” variables Notice (from the initial expression) 3+4 is 7!

Product of a Power If you multiply powers having the same base, add the exponents.

Example Simplify: Add the exponents since the bases are the same Anything raised to the 0 power is 1

Practice Simplify the following expressions:

Exploration Simplify: Adding 3 five times is equivalent to multiplying 3 by 5. The same exponents from the initial expression! The Product of a Power Rule says to add all the 3 s Use the definition of exponents to expand

Power of a Power To find a power of a power, multiply the exponents.

Example Simplify: Multiply the powers of a exponent raised to another power Any base without a power, is assumed to have an exponent of 1 Multiply numbers without exponents and add the exponents when the bases are the same

Practice Simplify the following expressions:

Exploration Simplify: Adding 2 five times is equivalent to multiplying 2 by 5 Notice: Both the z 2 and x were raised to the 5 th power! The Product of a Power Rule says to add the exponents with the same bases Use the definition of exponents to expand

Power of a Product If a base has a product, raise each factor to the power

Example Simplify: Everything inside the parentheses is raised to the exponent outside the parentheses Multiply the powers of a exponent raised to another power Multiply numbers without exponents and add the exponents when the bases are the same

Practice Simplify the following expressions:

First Four 1. 125 x 3 2. 64 d 6 3. a 7 b 7 c 4. 64 m 6 n 6 5. 100 x 2 y 2 6. -r 5 s 5 t 5 7. 27 b 4 8. -4 x 7 9. -15 a 5 b 5 10. r 8 s 12 11. 36 z 11 12. 18 x 5 13. 4 x 9 14. a 4 b 4 c 6 15. 125 y 12 16. 64 x 11 17. 256 x 12 18. 9 a 8 19. 729 z 10 20. 321 21. 108 a 11 22. -81 x 17

Exploration Complete the tables (with fractions) by finding the pattern. 55 3125 54 625 53 125 52 25 51 5 50 1 5 -1 1/5 5 -2 1/25 1/125 1/625 5 -3 5 -4 ÷ 5 ÷ 5 ÷ 5 1/32 1/16 1/8 ¼ ½ 1 2 4 8 16 x 2 x 2 x 2

Negative Powers Negative Exponents “flip” and become positive A simplified expression has no negative exponents.

Example Simplify: All of the old rules still apply for negative exponents Flip ONLY the thing with the negative exponent to the bottom and the exponent becomes positive This is not simplified since there is a negative exponent

Example Simplify: Everything with a positive exponent stays where it is. Everything with a negative exponent is flipped and exponent becomes positive. Since all of the negative exponents are gone, apply all of the old rules to simplify.

Practice Simplify the following expressions:

Exploration Simplify: Use the definition of exponents to expand The 6 “x”s in the denominator cancel 6 out of the 10 “x”s in the numerator. This is the same as subtracting the exponents from the initial expression! Since everything is multiplied, you cancel common factors Only 4 “x”s remain in the numerator

Quotient of a Power To find a quotient of a power, subtract the denominator’s exponent from the numerator’s exponent if the bases are the same.

Example Simplify: Divide the base numbers first Not simplified since there is a negative exponents Subtract the exponents of the similar bases since there is division Flip any negative exponents

Practice Simplify the following expressions:

Exploration Simplify: Use the definition of exponents to expand Multiply the fractions Use the definition of exponents to rewrite. Notice: Both the numerator and denominator were raised to the 6 th power!

Power of a Quotient To find a power of a quotient, raise the denominator and numerator to the same power.

Example Simplify: Everything in the fraction is raised to the power out side the parentheses. Subtract the exponents when there is division, and add when there is multiplication Multiply the fractions

Practice Simplify the following expressions: