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Let \(u=\sqrt{x}\), then x = \(u^2\)
Now, the equation becomes
\[u+7-u^2=1\]
Can you do it?

Wat?

I guess. Sorry, it doesn't show parentheses on my math problem.

Is the equation (1)\(\sqrt{ x+7-x} =1\) or (2) \(\sqrt{x}+7-x=1\)?

nvm, i got the answer. Thx

nvm.. I tried wolframalpha. But only get two step by steps each day:(

I'll have to get the answer tomorrow.

It would be better if you know how to solve it, instead of just relying on WolframAlpha.

Honestly, I just need credits/passed classes

you can argue all you want, but it's true.

can you just show me please? I'm 18 lessons behind:(

\[\sqrt{x+7}-x=1\]

add x to both sides

It would be a different story if I wasn't that behind

\[\sqrt{x-7-x}=1\]\[\sqrt{x-7}-x=1\]\[\sqrt{x}-7-x=1\]
Which one is your question?

yup

what next?

so now u have|dw:1388897108757:dw| now square both sides

i know 9 is the solution

what next?

did u square both sides. and simplified it?

how do I simplify it?

|dw:1388897450469:dw|does that make sense?

yeah.

what next?

subtract x and 7 on both sides so that the equation equal 0

|dw:1388897691356:dw|

what next? :D ha

|dw:1388897800670:dw| can u factor the right side?

can you show me? eheh

|dw:1388898386363:dw|

9?

it has to be 9.

no, i dont think 9 is a solution. try pluggin it back into the origianl equation. it doesnt work

|dw:1388899069611:dw|

then you did it wrong. Ugh. Wolfram said it was 9

no, im for sure 9 is not an answer. it doesnt make sense. its one fo those^

sorry, nikato. I gotta make sure.

yea, its fine. whatever u feel is right

nikato's right.

maybe u typed in the wrong equation in wolfrma

nikato, what do I do next? Sorry for doubting you

one of them is 2.

yes. and the other?

o?

no, -3. so now u want to find if there is anyextraneous answers

plug both back into the equation and see if they make sense|dw:1388900195738:dw|

ugh. How much more is there??

what next?

it's 1.

thanks. :p

I did it in my calculator. How'd you get your answer?

no, thats not what i meant

|dw:1388901004098:dw|

so what is the answer???

just 2

becuz like i said ^ -3 is an extraneous solution

so, I would put "x=2 only"?

yup