Obtain Quadratic Formula by Completing the square method

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Mr Lim

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Published on January 22, 2015 9:48:50 AM ● Video Link: https://www.youtube.com/watch?v=wQ9u9Xu8JKs

Duration: 4:25

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Language use in this video is Mandarin.
We know that roots of quadratic Equation by formula ( x=(-b+/- Square root (b^2 - 4ac)/2a ) . In this video, I show that we can obtain this formula by doing completing the square to the quadratic equation ax^2 +bx + c = 0.