This Lesson (PROOF of quadratic formula by completing the square) was created by by ichudov(332): View Source, Show About ichudov: I am not a paid tutor, I am the owner of this web site.
Consider this quadratic equation:
Try to use "completing the square":
add and subtract
Rewrite the equation
Factor for a
Factor the complete square
Multiply both sides by
Take the square root for both sides or or