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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: 13,154

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.


Character is who you are when no one is looking.

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