@wio pretty tiered so im not sure why this isn't adding up in my head but.. y=2x^2-4x+1 .. i can only see as (2x-1)(x-1).. and that gives 2x^2-3x+1..

Question

@wio  pretty tiered so im not sure why this isn't adding up in my head but.. y=2x^2-4x+1 .. i can only see as (2x-1)(x-1).. and that gives 2x^2-3x+1..

psymon · Answer

Yeah, youre not going to get an answer that clean.

psymon · Answer

Need quadratic formula for it, if you know the formula.

anonymous · Answer

$$
-2x-x\neq -4x
$$

anonymous · Answer

oh the -b= the square root of (x1-x2)^2-(y1-y2)^2 ?

psymon · Answer

Not quite. 
$$\frac{ -b \pm \sqrt{b ^{2}-4ac} }{ 2a }$$

anonymous · Answer

Can't you use quadratic formula to find the roots here?

anonymous · Answer

hmm, i don't remember discussing that formula this week. I know it. so i guess ill use it.

anonymous · Answer

i got rad 2 over 2..

psymon · Answer

So....(4 +/- sqrt(16-8))4
$$\frac{ 4\pm2\sqrt{2} }{ 4 }=1\pm \frac{ \sqrt{2} }{ 2 } $$

Somehow you got rid of your +/- and the 1. You need the plus and minus for your solutions, not just the one sqrt2/2 solution.

anonymous · Answer

oh yea. Srry. Just thought the 1 wasn't important. Im starting to remember this stuff.

psymon · Answer

It's all important. You want the correct answer, not something kind of close xD

anonymous · Answer

Thanks a lot!

psymon · Answer

Yep, sure :3