philllip1882 1 Posted November 12 Report Share Posted November 12 i cant for the llfe of me find the flaw with his logic. somewhere between factoring each polynomial and the step before is wrong. but i see no mistake. 1 Quote Link to post Share on other sites
1 EventHorizon 16 Posted November 12 Report Share Posted November 12 Spoiler The error happens when he takes the square root of both sides. (4-9/2)^2 = (-1/2)^2 = (1/2)^2 = (5-9/2)^2 Or more simply... (-1)^2 = (1)^2, take the square root of both sides gives -1 = 1. Except it doesn't! sqrt((-1)^2) = |-1| = |1| = sqrt(1^2) 1 Quote Link to post Share on other sites
0 Martyna 0 Posted November 18 Report Share Posted November 18 This is so hard! Quote Link to post Share on other sites
0 pro 0 Posted Monday at 06:53 PM Report Share Posted Monday at 06:53 PM Spoiler so you cant say that just because X2 = Y2, X = Y, that would be theoretically incorrect. X2 = Y2 implies that X = |Y| where |a| or mod(a) denotes +/-a. From there we eliminate the absurdity and only consider the solution for the equation that makes sense Quote Link to post Share on other sites
Question
philllip1882 1
i cant for the llfe of me find the flaw with his logic.
somewhere between factoring each polynomial and the step before is wrong. but i see no mistake.
Link to post
Share on other sites
3 answers to this question
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.