Completing the square formula is used to do the analyzing at which point the quadratic expression has minimum/maximum value. It can be used for graphing a quadratic function. Completing the square formula can also be used for solving a quadratic equation and deriving the quadratic formula.
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Completing the square formula is a technique or method to find the roots of the given quadratic equations. A quadratic equation in its standard form, in variable x, is ax2 + bx + c = 0, where a, b and c are any real numbers but a ≠ 0.