Math Is Fun Forum

esatpllana

Member

Registered: 2007-11-22

Posts: 12

how to solve this

bye

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mathsyperson

Moderator

Registered: 2005-06-22

Posts: 4,900

Re: how to solve this

Taking a 1 out of the fraction on the left looks like it would help.

From there, solve the quadratic equation twice (first with 2 on the right and then with -2).
If you're working in the reals, I think you only get one solution.

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saudi_boy

Member

Registered: 2006-11-01

Posts: 41

Re: how to solve this

first simplify this expression

by usining division by -1 you will find f(x) = 0
thats means -1 is the first zero

you will get

divide by -1 again

and you can complete the answer

luca-deltodesco

Member

Registered: 2006-05-05

Posts: 1,470

Re: how to solve this

I think I prefer mathsyperson's method, it's shorter and doesn't require you to guess a root

The roots from mathsyperson's quadratic are -1 and -1 ± 2i, which are the same as yours saudi_boy.

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phamthephong100

Member

Registered: 2007-10-13

Posts: 8

Re: how to solve this

we can see x^2+2x+3<>o with any x belong to R
let

we have
       

  or

*

*

impossible to solve hehe
Please give me your opions about this method
Thanks

Last edited by phamthephong100 (2008-01-30 17:49:03)