Download AbsVal Recip 1 - Absolute Value shorter_2

Math 20-1
Absolute Value & Reciprocal Functions: Lesson #1
Absolute Value
Objective: By the end of this lesson, you will be able to:
Warm-Up
 Mark the numbers 3 and -3 on the number line below.
0

What is the distance from each of the points you plotted to 0?

Why is the answer the same regardless of which side of 0 the point is on?
The absolute value of a number is
The symbol for absolute value is vertical bars on either side of the number or expression:
e.g. 1) Evaluate the following:
a)  75
b)
3.4
Official Definition of Absolute Value:
 If a number is positive (or zero), its absolute value is the number itself:

If a number is negative, its absolute value is the same number with the opposite sign:
We can write this in one statement as follows:
Math 20-1
Absolute Value & Reciprocal Functions: Lesson #1
When evaluating an expression that includes absolute value, treat the absolute value signs as
__________________ and use __________________________________.
e.g. 2) Evaluate the following:
a) 5   17
c) 8  3 2  7
b)
5   17
d)
 4 3  1  6
2
e.g. 3) The Canadian record for temperature change occurred in Pincher Creek, AB in 1962
when a chinook raised the temperature from -19 °C to +22 °C in one hour. Write an
expression using absolute value to show the temperature change. Then determine the
change in temperature.
e.g. 4) A stock on the Toronto Stock Exchange (TSX) opened the month at $13.85 per share,
dropped to $12.70, increased to $14.05, and closed the month at $13.55.
a) Determine the net change in the stock for the month.
b) Determine the total change in the value of this stock for the month.
Assignment:
p. 363-367 #1, 2, 4-8, 11-13, 19
For a challenge: #15, 16, 25