מחשבון פרבולה

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מבוא

Parabola Calculator — Find the vertex, focus, and directrix of a parabola. Enter a, b, c to get an instant, accurate result.

נוסחה

For y = ax² + bx + c: vertex x = −b/(2a), vertex y = a(vertex x)² + b(vertex x) + c. With p = 1/(4a), the focus is at (vertex x, vertex y + p) and the directrix is the line y = vertex y − p.

צעד אחר צעד

Enter the a.
Enter the b.
Enter the c.
Click Calculate to see your result instantly.

דוגמה מהעולם האמיתי

Example: With a = 1, b = -4, c = 3, the Parabola Calculator gives Vertex X: 2, Vertex Y: -1, Focus Y: -0.75.

שאלות נפוצות

What if a = 0?

That's a straight line, not a parabola — a must be nonzero.

What are the focus and directrix used for?

Every point on the parabola is equidistant from the focus and the directrix line — they define the parabola's geometric shape.

What inputs does the Parabola Calculator need?

You'll need to provide: a, b, c. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Parabola Calculator?

The Parabola Calculator applies the formula exactly as calculated — For y = ax² + bx + c: vertex x = −b/(2a), vertex y = a(vertex x)² + b(vertex x) + c. With p = 1/(4a), the focus is at (vertex x, vertex y + p) and the directrix is the line y = vertex y − p. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Parabola Calculator free to use?

Yes, the Parabola Calculator is completely free, requires no signup, and runs instantly in your browser.

אודות מחשבון פרבולה

The Parabola Calculator uses a real, verifiable formula — For y = ax² + bx + c: vertex x = −b/(2a), vertex y = a(vertex x)² + b(vertex x) + c. With p = 1/(4a), the focus is at (vertex x, vertex y + p) and the directrix is the line y = vertex y − p. — so results are accurate every time, not an approximation.

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