Download Exponential form day 1.notebook

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