Will give Fan and Medal!! The steps to derive the quadratic formula are shown below:

Question

anonymous · Answer

The question is in file

anonymous · Answer

@zepdrix @iambatman

zepdrix · Answer

hey c:

Hmm I don't see the mistake -_- lemme keep looking..

anonymous · Answer

I know for sure that the answer is not B, so atleast that narrows it down a bit. And thank you for helping me c:

zepdrix · Answer

It's definitely not A, we have to add that squared term to each side.

zepdrix · Answer

Check out steps 6 and 7, which one do you think it is? c:
Where is the error?

anonymous · Answer

Okay so either C or D

anonymous · Answer

I beleive that the mistake would be in the last step i think

zepdrix · Answer

Yessss!
$$\Large\rm \text{In step 6:}\quad \sqrt{-\frac{c}{a}+\left(\color{orangered}{\frac{b}{2a}}\right)^2}$$$$\Large\rm \text{In step 7:}\quad \sqrt{-\frac{c}{a}+\left(\color{orangered}{\frac{b}{4a}}\right)^2}$$Do you see the boo boo they made?

anonymous · Answer

Yes, they did 4a instead of 2a, Right?

zepdrix · Answer

Yes.
Ok good job \c:/

anonymous · Answer

Thank you very much c: @zepdrix