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“Quadratic Equations” edits
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njerig authored Jun 8, 2024
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Expand Up @@ -24,14 +24,13 @@ $$
\right.
$$

This allows us to factor the quadratic expression as:
(The second case was not much harder; I told him to just divide the whole equation by $$a$$ and he'll end up in a situation similar to the first case.)

$$(x - \underline{\hspace{1em}})(x - \underline{\hspace{1em}})$$
This allows us to factor the quadratic expression into the form:

However, there were two things that were not immediately obvious to me without using the guess-and-check method for factoring most of us learned in school.
$$(x - \underline{\hspace{1em}})(x - \underline{\hspace{1em}})$$

1. How do we mathematically determine which two numbers solve the system?
2. How do we handle the case where $$a \neq 1$$?
However, there was something not immediately obvious to me (without using the guess-and-check method for factoring most of us learned in school): **how do we mathematically determine which two numbers solve the system?**

The student was also overwhelmed by the idea of having to remember the quadratic formula for the cases where the quadratic expression "cannot be factored cleanly".

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