/sci/ - Science & Math

>>11365784
This has been SOLVED (original asker).

>>11366878
This has NOT. Proof in question is pic related (trying to prove the discriminant > 0 without substituting x = -b/2a. Only reason I'm asking is I found this reply:
>NOOOOO
>what did you do...
>this should be an easy proof by contraposition
>First consider the discriminant to be zero or gfreater, then you can plug this into the Quadratic equation and you get an Solution where ax^2+bx+c=0 and you got your contradiction


And the OP ITT says my proof isn't good, but why? It's perfectly valid, right? Though the contrapositive proof outlined above is probably better, my proof is essentially the same thing, just fleshed out with algebra, isn't it?