Evaluating Functions and Function Notation

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CCSS.HSF.IF.A.2

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CCSS.HSF.IF.A.2

How would you write y = 2x - 3 in function notation?

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

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CCSS.HSF.IF.A.2

If f(x) = 2x + 1, what would be your first step to find f(1)?

• Plug a 1 in for all the x's

• Set the function equal to 1

• Only plug a 1 into the left side

• Only plug a 1 into the right side

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CCSS.HSF.IF.A.2

Mathematical Equivalence

ON

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CCSS.HSF.IF.A.2

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• -6

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• -14

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CCSS.HSF.IF.A.2

If g(x) = 1 - 3/4x,

7. g(-12) = ​ (a)  

8. g(0) = ​ (b)  

9. -5 times g(4) - 1 = ​ (c)  

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• You can handle the fraction!

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CCSS.HSF.IF.A.2

Match each FUNCTION with a CORRECT SOLUTION. Notice: The input values are NOT all the same. Calculator recommended, but not necessary.

• f(-5) = 11

• f(x) = 11 - x

• f(4) = 12

• f(x) = 0.75x + 9

• f(5) = -6

• f(x) = -4x - 9

• f(-1) = 12

• f(x) = 5x + 21

• f(-1) = 16

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CCSS.8.F.A.1

CCSS.HSF.IF.A.1

• 16

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• -28

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CCSS.HSF.IF.A.2

If f(x) = 8 - 5x,

13. f(4c) = ​ (a)  

14. f(2 - k) = ​ (b)  

16. f(4p + 3) = ​ (c)  

• 8 - 20c

• -2 + 5k

• -20p - 7

• 8 + 20c

• 2 + 5k

• -20p + 7

• stop guessing and work it out :)

• Maybe ask for help???

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CCSS.HSF.IF.A.2