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#1 2006-03-07 22:24:59

4littlepiggiesmom
Member
Registered: 2006-01-09
Posts: 42

one more problem 2 actully 2

for
2x^2 +10x -5 =0 and I get  -0.56 and 4.44 my son get the same???

and the other one -6x^2 - x -1/3= 0 and I get 1 or .5 my son has -.91 or .24??/
thanks for any helpdunno

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#2 2006-03-07 22:59:16

RickyOswaldIOW
Member
Registered: 2005-11-18
Posts: 212

Re: one more problem 2 actully 2

The smart people seem to be sleeping right now, if you have some time they will be here in a few hours and will solve all your problems smile
Well, many of your maths related ones at least


Aloha Nui means Goodbye.

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#3 2006-03-07 23:19:11

4littlepiggiesmom
Member
Registered: 2006-01-09
Posts: 42

Re: one more problem 2 actully 2

that's ok I figured thiem out now any way! and yeah my kids will be getting up soon to get ready for school...hopefully i'll have check all of these buy then! Thanks again!~ H

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#4 2006-03-07 23:19:42

RickyOswaldIOW
Member
Registered: 2005-11-18
Posts: 212

Re: one more problem 2 actully 2

Wish them luck from me.


Aloha Nui means Goodbye.

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#5 2006-03-07 23:24:36

ganesh
Moderator
Registered: 2005-06-28
Posts: 20,762

Re: one more problem 2 actully 2

2x²+10x-5=0, a=a, b=10, c=-5.
x = [-10±√(100+40)]/4 =
(√140=11.832 approximately)x=0.458 and -5.458


(2) For -6x² -x - 1/3=0, the equation can be rewritten as -18x² -3x-1=0
or 18x² +3x+1=0.
x = [-3±√ (9-72)]/36. The roots are not real as we got square root of an imaginary number.
When the discriminant, i.e. b²-4ac<0, the roots are imaginary.
In this case, the discriminant is equal to -63.

You can also go to this link for quadratic equation solver on this website.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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