1-2 Part 2 Evaluating Expressions

1-2 Part 2 Evaluating Expressions

I CAN: use the order of operations to evaluate expressions.

1.OpenerSimplify these.

a)

b)

c)

d) This sequence goes on for 784 numbers. What is the sum?

e) What does Manero’s Steakhouse in Greenwich, CN, offer to any baby born in the restaurant?

7 101 9

10 (8) ( 2) 7

(5)( 2)(3)( 4)( 1)

11 11 1

Vocabulary to KnowVocabulary to Know

• Evaluate– Replace each variable with a given number

and then simplify.

4.Evaluating

7 + 8

4.Evaluating

a + xEvaluate:

for a = 7 and x = 8

4.Evaluating

a + xEvaluate:

for a = 12 and x = 10

4.Evaluating

a + xEvaluate:

for a = 1 and x = 14

4.Evaluating

a + xEvaluate:

for a = 1,500 and x = 23,000,000

4.Evaluating

b2 - 4acEvaluate:

for a = 7, b = -5, and c = 2

4.Evaluating

b2 - 4acEvaluate:

for a = , b = , and c =

Evaluating Evaluating

x = 5

y = 2

x2 + x – 12 ÷ y2

Evaluating Evaluating

x = 5

y = 2

(xy)2

EvaluatingEvaluating

• a = 3• b = 4

3b – a2

EvaluatingEvaluating

• a = 3• b = 4

2b2 – 7a

EvaluatingEvaluating

• Find the value of xy2 for x = 5 and y = 2.

• Now, find the value of (xy)2 for the same x and y values.

• What can you conclude?

Focus Question AnswerFocus Question Answer

• How is evaluating an algebraic expression different from evaluating a numerical expression?

BIG IdeaBIG Idea

• When evaluating an expression, values of the variables must be substituted into the expression before simplifying.

!Real World!!Real World!

• What is an expression for the spending money you have left after depositing of your wages in savings? Evaluate the expression for weekly wages of $40, $50, $75, and $100.

!Real World!!Real World!

• The shipping cost for an order on Amazon is the cost of the items your order. What is an expression for the total cost of a given order? What are the total costs for orders of $43, $79, $95, and $103?

Your AssignmentYour Assignment

• Pages 17-18• 3-4• 6-24• 29-48

AttributesAttributes

• •Textbook:  Prentice Hall Algebra I Foundations Series

• •Certain slides were lifted from Dan Meyer’s amazing algebra curricula through use of a Creative Commons attribution license.  If you haven’t been to Mr. Meyer’s website and you teach math, you’re surely missing out!