Function Notation

Evaluate functions using f(x) notation.

1️⃣

Watch the video

Start here (or skip if you already know it)

2️⃣

Visualize it

Explore it, then spot the correct graph

3️⃣

Practice problems

Answer 3 problems (80%+ correct)

Step 1: Watch

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What Are Functions?

Math Antics · 11:34

Play with the interactive model to see how the math works, then test yourself by spotting the correct graph.

Move the controls and watch the math change — build a picture in your head before you solve.

y = 1x + 2

Slope (m)1y-intercept (b)2

The slope 1 tells you to go up 1 for every 1 step right. The y-intercept 2 is where the line crosses the y-axis, at the point (0, 2).

Answer 3 problems with at least 80% correct to complete this skill.

Problem 1

If f(x) = 2x + 3, find f(4).

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