Transcript Document
Do Now 9/7/10
Copy HW in your planner.
Text p. 5-7, #4-52 multiples of 4 In your journal, answer the following question.
How do you evaluate algebraic expressions and powers?
Then solve the example, when n = 4. 14
n
Objective
SWBAT evaluate algebraic expressions and use exponents
Section 1.1 “Evaluate Expressions”
VARIABLE
a letter used to represent one or more numbers.
To
EVALUATE AN ALGEBRAIC EXPRESSION-
substitute a number for each variable, perform the operations and simplify, if necessary.
13
n
= 13 = 39 3
Substitute
3
for
n .
Multiply.
Evaluate the expression when
n
= 3.
a.
9
n
= = 3 9 3
Substitute
3
for
n
.
Divide.
b.
n
– 1 = 3 – 1 = 2
Substitute
3
for
n
.
Subtract.
Evaluate the expression when
y
= 2.
c.
6
y
= 6 = 12 2
d.
y
+ 4 = 2 + 4 = 6
Substitute
2
for
y .
Multiply.
Substitute
2
for
y
..
Add.
POWER
an expression that represents repeated multiplication.
4 2
EXPONENT
2 Product 2 2 2 Words two to the fourth power
BASE
GUIDED PRACTICE Evaluate the expression.
1 .
x
3
when
x
= 8
2 .
k
3
when
k
= 2.5
3 .
d
4
when
d
= 1 3
1 .
x
3 = 8 3 = 8 8 8 = 512
2 .
k
3 = 2.5
3 = (2.5)(2.5)(2.5) = 15.625
3 .
d
4 = ( ) 3 4 1 = = 3 1 81 1 3 1 3 1 3
Homework
Text p. 5-7, #4-52 multiples of 4
D105 Classroom Scavenger Hunt