7 Replies
@Apu
Note for OP
+solved @user1 @user2...
to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.Proof by contradiction works here ig.

Also a and c must be positive as plugging in y=0 and x=0 gives ax^2>0 and cx^2>0
+solved @SirLancelotDuLac
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