Write an equation in slope-intercept form. Bell Ringer Write an equation in slope-intercept form. 1. 6x + y = 5 2. y – 4x = 7 3. y + 3 = 15x 4. -4 + y = 20x

Section 9.1 Powers and Exponents R drive > Key > Jan 26_30 > 1_26__9.1 Powers and Exponents File > Save As > P drive > Math > Jan 26_30 > 1_26__9.1 Powers and Exponents

Vocabulary Make sure you start a new section in your vocabulary since this will be for a new unit. Exponent – Tells how many times a number is used as a factor Power – A number that is expressed using an exponent Base – The number that is multiplied

Notes We use exponents to tell us how many times a number is used as a factor. Instead of 5 x 5 x 5, we write:

Notes How to read and write powers:

Notes

Example 1 Write Expressions using Exponents

Example 2 Write Expressions using Exponents Write each expression using exponents.

Example 3 – Your Turn Write Expressions using Exponents Write each expression using exponents. 1. 9 x 9 x 9 x 9 2. (-1)(-1)

Example 4 Write Expressions using Exponents

Notes <<<BEWARE>>>

Example 5 Write Expressions using Exponents

Example 6 – Your Turn Write Expressions using Exponents Write each expression using exponents. w · w · w · w · w (5x + 1)(5x + 1) ½ · x · x · x · x · y · y· y

Notes

Example 7 Evaluate Expressions

Example 8 Evaluate Expressions

Example 9 – Your Turn Evaluate Expressions North American hockey rinks are built according to National Hockey League specifications. Evaluate each expression to find these dimensions. The distance from the goal line to the closest blue line is 26 feet. The length of the rink is 23 · 52 feet.

Example 10 Evaluate Algebraic Expressions

Example 11 Evaluate Algebraic Expressions

Example 12 – Your Turn Evaluate Algebraic Expressions Evaluate x2 – y3 if x = -5 and y = 2

Homework Section 9.1 #12 - 36

Homework Section 9.1 #12 - 36