quadratic formula problem

http://img11.imageshack.us/img11/6299/formd.jpgi got this far but now this is wrong answer any help would be great (Bow)

Your mistake is in your fourth line. Should be -2 +/- 2 sqt(7) on top.

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Originally Posted by Debsta

Your mistake is in your fourth line. Should be -2 +/- 2 sqt(7) on top.

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is this what you mean
http://img18.imageshack.us/img18/214/form2f.jpg

Yep!

Then you can factorize and simplify.

1

2

Hey Bacterius,
For future reference, how do you self-delete things that you wish you hadn't posted. Hasn't happened to me yet, but I'm sure it will.

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Originally Posted by Debsta

What the? 7^2 = 49 not 28 ????

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2^2-4x(-2)x3 =28

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Originally Posted by Debsta

What the? 7^2 = 49 not 28 ????

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i dont get how you get this can u please explain (Bow)

and to delete a comment you select edit then delete (not sure if that was sarcasm) |:)

Yep. You're right... I was responding to Bacterius. All you have to do now is factorise out the 2 and cancel and you're done.

7

thats the answer but i cant see how cancelling out gets that (Thinking)http://img41.imageshack.us/img41/679/form3.jpg

where did the positive 2 go?

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Originally Posted by Bacterius

Forget this Realistic, it's my stupidity. You got it right.

Debsta, I don't know, I have some quickly-posted things I want to clear but can't find the delete command ... I'll have to look in the FAQ.

EDIT : I've seen you can't delete your threads because of various reasons. I guess the same goes for posts ... what if I really want to remove the evidence ? :)

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dont worry i really appreciate all the help (Bow)

Thanks, Realistic. I successfully deleted my earlier comment.
Wasn't sarcasm before - a serious question :)
BTW your final answer is [1 +/- sqrt(7)]/2.