Difference between revisions of "Quadratic formula"
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Latest revision as of 18:39, 10 December 2024
The quadratic formula is a general expression for the solutions to a quadratic equation. It is used when other methods, such as completing the square, factoring, and square root property do not work or are too tedious.
Contents
[hide]General Solution For A Quadratic by Completing the Square
We start with
Divide by :
Add to both sides in order to complete the square:
Complete the square:
Move to the other side:
Take the square root of both sides:
Finally, move the to the other side:
This is the quadratic formula, and we are done.
Video Solution
Variation
In some situations, it is preferable to use this variation of the quadratic formula: