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Plot a quadratic, find its roots

Type a quadratic like x^2 - 2x - 3, see its parabola and find exactly where it crosses the x-axis.

Drag to pan, scroll or pinch to zoom

Functions

    Use x, + − * / ^, brackets, sin, cos, tan, sqrt, abs, ln, log, exp, pi and e. Multiplication can be implied, as in 2x or 3(x+1).

    Roots and intersections

      Table of values

      Typing functions

      Write the right-hand side of y = f(x), such as x^2 - 4, sin(x) or 1/(x-2). You can type y = in front if you like. Powers use ^, square roots use sqrt, and π is pi. Switch to DEG when you want sin(90) to equal 1.

      Moving around the graph

      Drag the graph to pan, scroll or pinch to zoom in on a point, and use the buttons to zoom or go back to the standard view. Move your cursor or finger over the graph to trace the nearest curve and read off x and y.

      Roots, crossings and tables

      Find in this view lists every place a curve crosses the x-axis and every point where two curves meet, inside the part of the graph you are looking at, to about ten significant figures. Tap a result to centre the graph on it. The table lists values at any start and step, ready for homework or checking a sketch.

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