quadratic

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17 Replies
iTeachChem Helper
iTeachChem Helper•4mo ago
@Apu
iTeachChem Helper
iTeachChem Helper•4mo ago
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.
hardcoreisdead
hardcoreisdeadOP•4mo ago
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hardcoreisdead
hardcoreisdeadOP•4mo ago
c>0 a<0 b^2-4ac>0 thats for sure main fuss is b -b/2a<0 a is -ve so b must be too ( this gives A , the correct ans in module) a<0 -b/2a<0 -b<2a b>-2a a is -ve so -2a is +ve so b is +ve so what should be the correct ans / @SirLancelotDuLac sorry for the ping but pls help
BlindSniper (BS)
BlindSniper (BS)•4mo ago
uh I haven't done any quadratic yet but from my parabola knowledge I know that y=ax^2 should make the curve be like a valley instead of a hill so I would mark D without even thinking since it's not given a is negative which kind of invalidates the question tbh
BlindSniper (BS)
BlindSniper (BS)•4mo ago
in this case this graph satisfies all the statement 2 options but it's clearly nothing like the graph shown
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BlindSniper (BS)
BlindSniper (BS)•4mo ago
basically what I'm saying is that the question is wrong and you should move on (don't listen to me) what book are you using btw I need to send a bad review
Spartan
Spartan•4mo ago
A is -ve -b/2a is also -ve Hence b is +ve
SirLancelotDuLac
SirLancelotDuLac•4mo ago
Look a<0 (Opening downward). Now look at the derivative at x=0, it is -ve. So b<0. The f(0)=c>0 from graph
hardcoreisdead
hardcoreisdeadOP•4mo ago
actually a<0 fiitjee package 😭 but agar b +ve ho gya toh -b/2a would become overall positive thus invalidating -b/2a<0 hmm that makes sense can you also tell why my approach is wrong this one
hardcoreisdead
hardcoreisdeadOP•4mo ago
@BlindSniper (BS)
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BlindSniper (BS)
BlindSniper (BS)•4mo ago
ew
SirLancelotDuLac
SirLancelotDuLac•4mo ago
(Line 3:) -b/2a<0 Doesn't imply -b<2a
hardcoreisdead
hardcoreisdeadOP•4mo ago
oh. mb however that does imply -b<0 for which b nust be >0
idk either
idk either•4mo ago
2a is negative, so inequality will reverse
hardcoreisdead
hardcoreisdeadOP•4mo ago
oh rightttt, my bad +solved @SirLancelotDuLac @idk either
iTeachChem Helper
iTeachChem Helper•4mo ago
Post locked and archived successfully!
Archived by
<@741159941934415883> (741159941934415883)
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