Remember the quadratic formula? Me, neither. Here's a better way to solve those algebra problems.https://www.nytimes.com/2020/02/05/science/quadratic-equations-algebra.html …
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I usually remember the equation and when I don’t derive it from first principal (fast as I basically know equation). Multiple ways fine but I wasn’t clear why this way much easier overall.
I personally never remember what "completing the square" means, so I have to look that up. For me, at least, this approach provides a clearer, faster derivation. It seems that not-top math students also find it easier to understand.
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I will look at it more carefully. When you learn one way others look harder :)
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If you what you know works, that's all you need.
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