Can someone please let me know if i done this correctly?

And if there is a faster way I'd love to know.

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- Jul 31st 2009, 05:48 PMel1233x = Square root of 3 + x
Can someone please let me know if i done this correctly?

And if there is a faster way I'd love to know.

- Jul 31st 2009, 06:03 PMVonNemo19
- Jul 31st 2009, 06:04 PMyeongil
(Psst, this should have been posted in the Pre-Algebra/Algebra subforum.)

Oops! That's not how to do it. You have to square both sides this way:

On the left side, both the 3 and x get squared. On the right side, the square-root and the power of 2 "cancel-out":

Then use the quadratic formula to solve for x.

01

EDIT: Beaten to it... (Rofl) - Jul 31st 2009, 08:24 PMWilmer
- Jul 31st 2009, 09:31 PMAlephZero
Even though others have pointed out an earlier mistake you made, I just want to let you know that there's a problem with this step, also. When taking the square root of both sides of an equation, you need to use the plus-or-minus sign, unless the question specifically tells you the answer is positive. Hence

.

Of course, as I and others have said, this is still not the correct value of for your problem; I just wanted to point out another place you went wrong in the hope of being helpful. - Jul 31st 2009, 09:39 PMyeongil
Also, ignoring the fact that you arrived at step 2 incorrectly, when going from step 2 to step 3, you need to FOIL.

For the love of (*insert deity here*), please remember this next time. I can't tell you how many times I've seen people make the same mistake. It's a pet peeve of mine. Arrrrgh! (Headbang)

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- Aug 1st 2009, 02:56 AMel123
Thanks for the help. Was a mistake , i should've seen what i had done wrong. Haven't done math in such a long time. Sometimes i just can't see where i've gone wrong. Hence why i asked for help.

- Aug 1st 2009, 03:21 AMsongoku
Hi el123

That's ok. This is indeed where you can seek for help ^^