Evaluating a Function Using Function Notation

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

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

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

If f(x) = 2x+1, what would the function look like once you substitute in a 1 to find f(1)?

• f(x) = 21+1

• f(1) = 2 (1) + 1

• f(1) = 2x (1) + 1

g(x) = 3x + 1
g(2) = _______

• 6

• 7

• 8

• 9

______

Mathematical Equivalence

ON

• 6

• -6

• 14

• -14

______

Mathematical Equivalence

ON

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

7. g(-12) = ​ (a)  

8. g(0) = ​ (b)  

9. -5 times g(4) - 1 = ​ (c)  

• 10

• 1

• 9

• -1

• -9

• You can handle the fraction!

What is x if
f(x) = -2?

• 4

• 0

• 3

• 8

Given h(x) = -9x +5, find h(8).

Mathematical Equivalence

ON