# Need help with maths quick . due in on friday

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17 years ago
#1
s h o w usi ng th eor ems of ca lc ulus th at the p o l y n o m i a l

p( x) = x ^5 + 2x ^3 - 5 x + 1 h a s a t le as t th r ee ro o t s

(had to put random spaces so that. the lecuturer wouldnt be able to google and find out i cheated)
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17 years ago
#2
(Original post by help me)
s h o w usi ng th eor ems of ca lc ulus th at the p o l y n o m i a l

p( x) = x ^5 + 2x ^3 - 5 x + 1 h a s a t le as t th r ee ro o t s

(had to put random spaces so that. the lecuturer wouldnt be able to google and find out i cheated)
Gosh, you're paranoid aren't you.
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17 years ago
#3
Gosh, you're paranoid aren't you.
need to be. its an assesed coursework. and if there is any hint of plagarism. i get null marks
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17 years ago
#4
(Original post by hel me)
need to be. its an assesed coursework. and if there is any hint of plagarism. i get null marks
Well, then maybe you should be good and do it the proper way.
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17 years ago
#5
Well, then maybe you should be good and do it the proper way.
i wouldnt be here . i f i could.
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17 years ago
#6
do you mean p(x)=0 has 3 roots?
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17 years ago
#7
(Original post by It'sPhil...)
do you mean p(x)=0 has 3 roots?
sh ow ta hat p9x has a t llleaaaaaast 3 rooots
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17 years ago
#8
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17 years ago
#9
(Original post by hlpgs)
why does the name keep changing!??????
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17 years ago
#10
(Original post by Saf!)
why does the name keep changing!??????
there
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17 years ago
#11
(Original post by cos i cant type)
there
come on pls
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17 years ago
#12
Well you can't expect someone to just do it for you!

But bear this in mind, you want to find where the polynomial equals zero, so imagine the graph of p(x) against x - what happens when p(x) equals zero? Also remember that a particular part of calculus (it's not that hard to figure out which) can eventually lead to finding turning points of the graph. That's about as much help I think a reasonable maths teacher would give, good luck!
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17 years ago
#13
(Original post by help me)
s h o w usi ng th eor ems of ca lc ulus th at the p o l y n o m i a l

p( x) = x ^5 + 2x ^3 - 5 x + 1 h a s a t le as t th r ee ro o t s

(had to put random spaces so that. the lecuturer wouldnt be able to google and find out i cheated)
This is really straightforward - just consider f(-10), f(0), f(1) and f(10).
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17 years ago
#14
(Original post by theone)
This is really straightforward - just consider f(-10), f(0), f(1) and f(10).
Admittedly that is the most straightforward way, but apparently calculus has to be used, ergo I think they're expected to do the old 'if a graph turns blah blah blah it must cross the axis' [/not even intended to be word for word accuracy )
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