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Exponential form day 1.notebook October 24, 2016 Grab a calculator!! DO NOW: What does it mean "press the square root of nine"? Exponents Day 1 8.EE.1 How can we write these mathematically? Use A = L X W 7" 7" 5 Use V = Lwh 5 5 Exponential form day 1.notebook Base the # used for repeated multiplication October 24, 2016 x n Exponent The # of times you multiply the base How can you read these? Write it out! 132 93 58 Review from 7th grade! What is this Expanded form called? 2 3 5 (( 6 5 = = This is called EXPONENTIAL NOTATION x { n .. . xn = (x x) n times In words multiply x, n times! Exponential form day 1.notebook October 24, 2016 Complete the following: Write the following in exponential form: a) 5 * 5 b) 7 * 7 * 7 * 7 * 7 9 9 9 9 9 c) 10 * 10 * 10 d) 2 * 2 * 2 * 2 3 3 3 3 e) 4 * 4 * 4 * x * x f) (4x) * (4x) * (4x) Exponential form day 1.notebook October 24, 2016 Exponential form day 1.notebook October 24, 2016 Eventually we will use the calculators to find the power!! Fraction key carrot key (^) (or yx) for 78 square key for 252 Evaluating Powers 63 = (5)4 = 92 = 25 = (3)5 = What if I said go backwards! Find 32 = 2 x 81 = 3 x 16 = ? x Exponential form day 1.notebook October 24, 2016 In your groups, answer the following in sentence form: 1) When a negative number is raised to an odd power, what is the sign of the result? 2) When a negative number is raised to an even power, what is the sign of the result? Then write these down and fill in the blank with either positive or negative! If n is a positive EVEN number, then (55)n is ___________ If n is a positive ODD number, then (72.4)n is ___________ Closing: a) What should be drawn around negative and fraction bases? Why b) #4 and #7