I’m not sure on how to get from this...


to this...


without having to expand everything first and rather putting the equation into an ax^2+ bx + c format
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Expand some brackets:


Regroup: x²(b-c)+x(b²-c²)+bc(b-c)=x²(b-c)+x(b-c)(b+c)+bc(b-c).

Common factor is b-c:



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