Add & Subtract Function Game (Evaluate)

Add & Subtract Function Game (Evaluate)
This game will require you to evaluate two functions given the input value and either add or subtract the results. Scroll down for a detailed explanation.
 

 

How to Play the Add & Subtract Function Game (Evaluate)

1. Identify Your Two Functions
   At the top of the card, you’ll see two separate equations:
   f(x) (Indigo): Your first rule.
   g(x) (Emerald): Your second rule.
   

2. Check the Operation & Input
   Look at the large white text in the center and the Target Input box:
   (f + g)(x): Means “Add the results of f and g together."
   (f - g)(x): Means “Subtract the result of g from the result of f."
   Target Input (x = ?): This is the specific number you plug into both equations.
   

3. The Strategy (3 Steps)
   To solve a problem like f(x) = x + 2, g(x) = 2x, and (f + g)(3):
   Step 1: Solve or Evaluate f(x)
   Plug your Target Input into the first equation.
   If x = 3, then f(3) = 3 + 2 = 5.
   

Step 2: Solve or Evaluate g(x)
Plug the same Target Input into the second equation.
If x = 3, then g(3) = 2(3) = 6.

Step 3: Combine them
Perform the operation shown in the middle of the screen.
Since it’s (f + g), calculate 5 + 6 = 11.
(If it were f - g, you would do 5 - 6 = -1).

4. Tips
   Watch for Absolute Value: |x - 5| means you solve the inside first, then make the result positive.
   The Negative Trap: If the operation is subtraction and g(x) is a negative number, remember that subtracting a negative is addition (e.g., 10 - (-5) = 15).
   

This video gives a clear, step-by-step approach to add & subtract functions (evaluate).

• Show Video

 

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