Graphing Calculator: Plot Functions, Zoom and Save the Graph

What is it?

The Graphing Calculator plots functions like y = x^2, sin(x) or 2x+1, several at once in different colours.

Who is it for?

Students learning functions, teachers preparing lessons, and engineers sketching curves.

How to use it

1. Type a function after y =, for example x^2 - 4. Tap + Add function for more; ✕ removes one.
2. Drag to move the graph, pinch or scroll to zoom, or use Zoom in / Zoom out. Reset view goes back to the start.
3. Download PNG saves the graph for homework or notes.

Typing maths

• Powers: x^2; roots: sqrt(x); multiply: 2*x or just 2x.
• Functions: sin, cos, tan, log (base 10), ln, exp, abs; constants pi and e.
• Use brackets generously: 1/(x+1) is not the same as 1/x+1.

Reading the graph

• Where the curve crosses the x-axis are the solutions of f(x) = 0. The Equation Solver gives exact values.
• Where two curves cross, both functions are equal there.
• Trigonometric functions use radians: one full wave of sin(x) is 2π ≈ 6.28 wide.

The graph looks wrong

• Functions like 1/x or tan(x) jump at points where they are undefined; a vertical line there is the jump, not part of the graph.
• I don’t know … means a word or function isn’t recognised; check the spelling.
• Zoom out if you see nothing: the interesting part may be outside the view.

Errors and how to fix them

• I don’t know “…”: a function name is misspelt; use sin, cos, sqrt, log, ln.

Open the tool: Graphing Calculator

Still stuck?

Contact support. Tell us which tool or page you were using, what you tapped, what you saw, and your phone or computer and browser (for example: Android phone, Chrome). We reply by email.