| Description | Examples |
|---|---|
| An equation can be solved by substituting a value for x. |
y = 6x + 2 x = 3 y = + 6(3) + 2 y = 18 + 2 y = 22 |
| When using function notation, the x value being substituted is written inside the parenthesis to show it is an input value. |
f(x) = 6x + 2 find f(4) f(4) = 6(4) + 2 f(4) = 24 + 2 f(4) = 26 The value of f(x) when x = 4 is 26. |
Evaluate f(x) = 4x – 5 for each of the following:
Click on the blanks to check your answer.
f(5) = Interactive button. Assistance may be required. _______ 15
f(0) = Interactive button. Assistance may be required. _______ -5
f(-2) = Interactive button. Assistance may be required. _______ -13
f1 over 2 ( 1 2 ) = Interactive button. Assistance may be required. _______ -3
If f(x) = 35, what is the value of x? Interactive button. Assistance may be required. _______ 10