Type y = x^2 - 4 on the first line and y = x + 2 on the second.
Tap the parabola: grey dots mark its zeros, its lowest point and where it crosses the line.
Tap a dot or read the key points list.
They cross at (−2, 0) and (3, 5).
See what a parameter does
How do a, h and k change y = a(x − h)² + k?
Type y = a(x - h)^2 + k.
Press the add slider buttons for a, h and k.
Drag each slider, or press play to animate it.
a stretches and flips the parabola, h moves it sideways and k moves it up and down.
A circle and its inside
Draw the circle of radius 5 and shade the points inside radius 3.
Type x^2 + y^2 = 25.
On a new line type x^2 + y^2 < 9.
Use equal axes so the circle looks round.
The circle is drawn and the disc of radius 3 is shaded, with a dashed edge because < does not include it.
你可以输入什么
y = 2x + 1 f(x) = x^3 − x f'(x) x = y^2r = 2cos(θ) (cos t, sin t) (2, 3)x^2 + y^2 = 25 y < sin(x) a = 1.5
Write multiplication without a sign (2x, 3(x + 1), xy), powers with ^, and functions with or without brackets: sin x, √x, |x|, ln, log, exp, floor, round, min, max and more. π, e and θ are built in.
A letter on its own line with a number (a = 2) becomes a slider. A line in x and y is drawn as an implicit curve, and <, >, ≤ or ≥ shades the region.