In our introduction to functions lesson, we related functions to a vending machine. You "input" money and your "output" is candy or chips! We're going to go back to that visual as we evaluate functions. We are going to "input" a number and our "output is the answer!
Let's take a look at a few examples!
Did you notice how we just substituted for x and we found our answer? Not too hard, is it?
Next you will see how using function notation makes it easier to display your answer if you are asked to evaluate the function more than one time!
Do you see how easy it is to keep our answer organized since we have two answers to display? We label them as f(-2) and f(3) to keep them organized!
I hope you are finding this to be pretty easy! You actually already know how to evaluate functions if you can evaluate equations. We are just giving it a different name!
Do you find that you need more help with evaluating functions? The Algebra Class E-course offers video tutorials, and practice problems with step-by-step solutions! It's like having your own personal tutor.
Are ready for a few practice problems?
1. Given the function: h(x) = -3x -5, find h(4) & h(-3).
2. Given the function: f(x) = x2+ 3x - 4, find f(-1) & f(4)
Great Job! I hope that you found evaluating functions pretty easy after all!
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