Algebra
Completing the Square Calculator
Lets users solve and check completing the square instantly with formula, steps and examples — no manual math.
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Vertex form
(x + 3)² − 4
Vertex form: a(x−h)²+k with h=-3, k=-4. Vertex at (-3, -4).
Vertex (h, k)
(-3, -4)
About this calculator
Completing the square rewrites ax²+bx+c as a(x−h)²+k, where h = −b/2a and k = c − b²/4a. The point (h, k) is the parabola's vertex.
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