section 2.8 3.1 powers and exponents - squ root (math)
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Sept. 09, 2010 Thursday’s Quiz:
Lesson 2-2 Comparing and Ordering Rational Numbers (compare fractions)
Lesson 2-8 Powers and ExponentsLesson 3-1 Square RootsLesson 3-2 Estimating Square RootsLesson 3-3 The Real Number System (compare
square roots)Lesson 4-1 Ratios and Rates
Section 2.8POWERS and EXPONENTS
Basic Terminology
.
,
.
,
TIONMULTIPLICA
repeatedundergoesthatVariableornumberthenotationlExponentiaInBase
factoraasusedis
basethetimesofnumberthenotationlExponentiaInExponent
42BASE
EXPONENTmeans 162222
Important Examples
IMPORTANT EXAMPLES81)3333(34 means
81)3()3()3()3()3( 4 means
27)333(33 means
27)3()3()3()3( 3 means
Variable Examples
Variable Expressions
))()((
))()()()(()(
3
5
yyymeansy
xxxxxtionmultiplicaforsparentheseusemeansx
Substitution and EvaluatingSTEPS
1.Write out the original problem.2.Show the substitution with parentheses.3.Work out the problem.
3;4: xxifSolveExample 3;4 xxifSolve
3)4( = 64
More Examples
ZERO AND NEGATIVE EXPONENTSANYTHING TO THE ZERO POWER IS 1.
27
1
3
13
9
1
3
13
3
1
3
13
13
33
93
273
33
22
11
0
1
2
3
22222
222
4
1
2
1
)2(
1)2(
2122
xxxx
xxx
8131
31
3
11
311
3
1 44
4
4
4
MULTIPLICATION PROPERTIESPRODUCT OF POWERS
This property is used to combine 2 or more exponential expressions with the SAME base.
53 22 )222( )22222( 82 256
))(( 43 xx ))()(( xxx ))()()(( xxxx 7x
Evaluate the variable expression when x = 1, y = 2, and w = -3
22 )()( yx
22 )()( yx
22 )2()1(
541
Step 1
Step 2
Step 3
2)( yx
2)( yx
2)2()1(
9)3( 2
Step 1
Step 2
Step 3
ywx
ywx
2)1)(3(
Step 1
Step 2
Step 3
3)1)(3(
MULTIPLICATION PROPERTIESPOWER OF PRODUCT
This property combines the first 2 multiplication properties to simplify exponential expressions.
2)56( )5()6( 22 9002536
3)5( xy ))()(5( 333 yx33125 yx
532 )4( xx 5323 ))(4( xx 5222 ))()(()64( xxxx
56 ))(64( xx 1164x
ZERO and NEGATIVE PROPERTIES
Zero power
1)( 0 x
Negative Exponents
aa
aa
xx
andx
x
1
1
Section 3.1
Square Roots
Find each square roots:
√25 -√81 √(4/9)
Solve the equations:
Y2 = 36 E2 = 144S2 = 9 / 25
Classwork / Homework:
Page 100 # 14 – 40 even
Wednesday’s work:Page 118 # 14 – 42 even
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