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

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