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1.2 Function Notation
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MCR3U Unit 2 – Intro to Function Date: 1.2 Function Notation
Homework: 1.1 Pages 10-‐13 Questions #1, 2, 4, 6, 9 1.2 Pages 22-‐24 Questions #1(c, d, e, f), 2, 3, 5(c, d), 6, 7, 10, 12, 16, 17 Learning Objectives/Success Criteria: At the end of this lesson I will be able to:
o Use function notation o Evaluate functions for different input values o Add, subtract, multiple and divide functions
Recall: Definition: Characteristics:
Examples: Non-‐examples
Function Notation: the notation f(x) is use to represent the value of a dependent variable (output) for a given independent variable (input). f (x) is read as “f at x” or “f of x” f is a function of the variable x y = 3x + 2 is in relation notation f (x) = 3x + 2 is in function notation. Evaluating Functions Example 1: Evaluating f (x) means you plug in a specific value of x into the function f. a) Create a table of values for f (x) = 3x + 2
b) Evaluate: i. f(1) ii. f(3)
iii. f(1)+f(3) iv. 3f(1)+4f(3)
v. f(a) vi. f(a+1)
x f (x)
-‐2
-‐1
0
1
2
Function
Piecewise functions: Functions that are split into different pieces defined by different domains. Evaluate: a) f(0) b) f(1)
c) f(2)
d) f(-‐2)+f(5) Finding the argument: The “x” in f(x) is called the argument of the function. If you are asked to determine the argument, you are looking for the value of x that satisfies the function f(x). Consider the functions f (x) = 3x +1 and g(x) = 2− x . Determine the values such that: a) f(x)=0 b) f (x) = g(x) c) ( f (x))2 = 2g(x) Functions and graphs: Evaluate for the function graphed f(x)=3(x-‐1)2-‐4 a) f (2)− f (1) b) 2f(3)-‐7 Using algebraic expressions in functions: Consider the functions f (x) = x2 −3x and g(x) = 3(x −1)
a) f (x)g(x)
b) f(2x)
c) g(x+2) Recall Number Types:
• Natural (Counting) Numbers: • Whole Numbers • Integers Numbers: • Rational Numbers (Fractions): • Real Numbers
f (x) = 2x2 −1, x <1x + 4, x ≥1
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