Intro to Functions

Functions Review

Open Ended

Answer this question while we wait for everyone to join. How has this week gone for you and why?

Remember, to evaluate functions, substitute the given value in for x.

• For example, if f(x) = 4x - 8, then f(3) = 4(3) - 8, which means f(3) = 4

Multiple Choice

g(x) = 11 - x
Find g(x) = -7 

• 4
• 17
• 18
• -77

Multiple Choice

f(x)=x²-5x
f(4)=

• -4
• 126
• 24
• 84

Multiple Choice

f(x) = 3x² - 11
Find f(-5)

• f(-5) = 64

• f(-5) = -86

• f(-5) = 214

• f(-5) = -7

Multiple Choice

Evaluate f(t)=-2t²+ 1 for f(-3)

• 19
  
• 37
• -17
• -11

Remember, in order to be a function, x cannot repeat

• In tables or ordered pairs, just check the domain (the x values)

• With mapping, each input can go to only one output

• With graphs, use the vertical line test to see if any vertical lines touch the function more than once (which would mean x repeated)

Multiple Choice

Is this table a function or not a function? 

• Function

• Not a Function

Multiple Choice

Which set of values is a function?

• (9,5) (10,5) (9,-5) (10,-5)

• (3,4) (4,-3) (7,4) (3, 8)

• (6,-5) (7, -3) (8, -1) (9, 1)

• (2, -2) (5, 9) (5, -7) (1, 4)

Multiple Choice

Which ordered pair could you add to the following list of points to create a function?  (3, 5) (4, 9) (2, 5) 

• (3, 7)

• (4, 1) 

• (1, 9)

• (2, 6)

Multiple Choice

Is this mapping a function or not a function? 

• Function

• Not a Function 

Multiple Choice

Is this graph a function or not a function? 

• Function
• Not a Function

Multiple Choice

• Function

• Not a Function

Multiple Choice

Which graph does NOT pass the vertical line test?

• Graph 1
• Graph 2
• Graph 3
• Graph 4

Multiple Choice

Is this mapping a function or not a function? 

• Function

• Not a Function

Poll

How do you feel about this lesson

• I understand and ready to move on

• I get it a lil bit

• Um I need more time on this

• A strong IDK on all of this

• I wasn't paying attention let's be real