parabola investigation IB HL Maths Watch

lispon
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#1
Report Thread starter 9 years ago
#1
Has anyone done this portfolio for maths?

I'm stuck on part 2.

Do the values of b and c stay the same? and you just change a?

Or are you suppose to change b and c as well and find limitations?
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Lorelle
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#2
Report 9 years ago
#2
i need help for number 5 and 6. there are just so many vertices that i don't know which one to take
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Blues_King
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#3
Report 9 years ago
#3
I'm doing this at the moment - i think there's only one vertex, isn't there? the vertex refers to the minimum turning point at the bottom of the quadratic curve? there should only be one.

if you like i can email you mine and you can have a look - but the IB will rape you if you copy it :P
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KristinaM
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#4
Report 9 years ago
#4
I'm doing it as well. I'm stuck on part 2 as well - just the conjecture thing. have no clue on how and what to conclude upon the value of D and a, besides that they have an inverse relation, but then what? what should I prove/state? just don't get it. hope there's someone out there who has the energy and time to explain. would be really helpful. thanks!
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Blues_King
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#5
Report 9 years ago
#5
maybe it's the fact that they have an inverse relation...? :P

make an equation that links D to a
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Blues_King
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#6
Report 9 years ago
#6
@lipson - yeah, change the value of a initially - once you start proving stuff you realise things about the values of B and C
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