Math Is Fun Forum
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#1 2015-02-05 04:50:16
Polynomial Roots
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#2 2015-02-05 09:15:58
- Bob
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- Registered: 2010-06-20
- Posts: 10,143
Re: Polynomial Roots
hi Agnishom,
I know you'll love to do this yourself ( 
) so I'll just give you the outline here:
If you consider
you can get a value for x1.x2.x3.x4.x5 straight away and hence -30.g(that product)
Now for each of the xi s:
So by evaluating
you can get the value of
You'll be pleased to learn that I've tried this approach (2/3 of a page) and got one of the multi-choice answers.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
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#3 2015-02-05 19:54:37
Re: Polynomial Roots
How large is your page?
Why does f(sqrt(2)) give those?
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#4 2015-02-05 22:01:45
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,143
Re: Polynomial Roots
so if you put x = root 2
Do a similar thing with x = -root2
Bob
ps. Page is A4
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
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#5 2015-02-06 00:13:58
Re: Polynomial Roots
Oh, thanks!
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
Offline
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