allegansveritatem
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- Joined
- Jan 10, 2018
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I was looking a method for deriving the quadratic formula from the form:ax^2+bx+c=0 but got taken up short when I couldn't account for the whereabouts of a term. Here is the book's presentation:
Now, what is puzzling me is this: Where does the b/a times x go after the 4th equals sign? I mean., between the 4th and the fifth line of this proof, the b/a times x seems to fall out of the world. What am I missing. I tried several times to prove derive this formula for myself and came up with some really exotic expressions.
Now, what is puzzling me is this: Where does the b/a times x go after the 4th equals sign? I mean., between the 4th and the fifth line of this proof, the b/a times x seems to fall out of the world. What am I missing. I tried several times to prove derive this formula for myself and came up with some really exotic expressions.