Over Lesson 1–1

Over Lesson 1–1

Lesson 1-2

Glencoe Algebra 1

ORDER OF OPERATIONS

Evaluate numerical expressions and algebraic expressions by using the

order of operations.

LEARNING GOAL

• evaluate – to find the value of

• order of operations – the rule which lets you know which operation to perform first.

VOCABULARY

Evaluate Expressions

Evaluate 26.

26 = 2 ● 2 ● 2 ● 2 ● 2 ● 2 Use 2 as a factor 6 times.

= 64 Multiply.

Answer: 64

A. 64

B. 128

C. 192

D. 256

Evaluate 44.

Use Order of Operations

Evaluate 48 ÷ 23 ● 3 + 5.

48 ÷ 23 ● 3 + 5 = 48 ÷ 8 ● 3 + 5 Evaluate powers.

= 6 ● 3 + 5 Divide 48 by 8.

= 18 + 5 Multiply 6 and 3.

= 23 Add 18 and 5.

Answer: 23

A. 6

B. 15

C. 30

D. 45

Evaluate [(92 – 9) ÷ 12]5.

Expressions with Grouping Symbols

A. Evaluate (8 – 3) ● 3(3 + 2).

(8 – 3) ● 3(3 + 2) = 5 ● 3(5)Evaluate inside parentheses.

= 5 ● 15 Multiply 3 by 5.

= 75 Multiply 5 by 15.

Answer: 75

Expressions with Grouping Symbols

B. Evaluate 4[12 ÷ (6 – 2)]2.

4[12 ÷ (6 – 2)]2 = 4(12 ÷ 4)2 Evaluate innermost expression first.

= 4(3)2 Evaluate expression in grouping symbol.

= 4(9) Evaluate power.

= 36 Multiply.

Answer: 36

Expressions with Grouping Symbols

Evaluate the power in the numerator.

C.

Multiply 6 and 2 in the numerator.

Subtract 32 and 12 in the numerator.

Expressions with Grouping Symbols

Evaluate the power in the denominator.

Multiply 5 and 3 in the denominator.

Subtract from left to right in the denominator.

Answer: 2

A. –60

B. 66

C. 88

D. 68

A. Evaluate the expression 2(4 + 7) ● (9 – 5).

A. 9

B. 18

C. 108

D. 3

B. Evaluate the expression 3[5 – 2 ● 2]2.

C.

A. 1

B.

C. 4

D.

Evaluate an Algebraic Expression

Evaluate 2(x2 – y) + z2 if x = 4, y = 3, and z = 2.

2(x2 – y) +z2 = 2(42 – 3) + 22 Replace x with 4, y with 3 and z with 2.

= 2(16 – 3) + 22 Evaluate 42.

= 2(13) + 22 Subtract 3 from 16.

= 2(13) + 4 Evaluate 22.

= 26 + 4 Multiply 2 and 13.

= 30 Add.

Answer: 30

A. 6

B. 28

C. 36

D. 10

Evaluate x3 – y2 + z, if x = 3, y = 2, and z = 5.

Write and Evaluate an Expression

ARCHITECTURE Each side of the Great Pyramid at Giza, Egypt, is a triangle. The base of each triangle once measured 230 meters. The height of each triangle once measured 187 meters. The area of a triangle is one-half the product of the base b and its height h.

Write and Evaluate an Expression

A. Write an expression that represents the area of one side of the Great Pyramid.

Write and Evaluate an Expression

B. Find the area of one side of the Great Pyramid.

Replace b with 230 and h with 187.

Multiply 230 by 187.

Multiply by 43,010.

Answer: The area of one side of the Great Pyramid is 21,505 m2.

A. 3813 ft2

B. 7626 ft2

C. 15,252 ft2

D. 32 ft2

Find the area of a triangle with a base of 123 feet and a height of 62 feet.

page 13 #15-35 odd; #36-38; #39-53 odd; #65-68

HOMEWORK