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 one year ago
check for extraneous solutions.
sqrt x+7x=1
Please show step by step on how to do this. Thankyou.
 one year ago
check for extraneous solutions. sqrt x+7x=1 Please show step by step on how to do this. Thankyou.

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RolyPoly
 one year ago
Best ResponseYou've already chosen the best response.0Let \(u=\sqrt{x}\), then x = \(u^2\) Now, the equation becomes \[u+7u^2=1\] Can you do it?

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0I don't get the way you're explaining it to me @RolyPoly

Krazete
 one year ago
Best ResponseYou've already chosen the best response.0Please make use of parentheses. The way you write problems is sorta confusing. Is it √(x+7)x=1 or ...?

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0I guess. Sorry, it doesn't show parentheses on my math problem.

RolyPoly
 one year ago
Best ResponseYou've already chosen the best response.0Is the equation (1)\(\sqrt{ x+7x} =1\) or (2) \(\sqrt{x}+7x=1\)?

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0nvm, i got the answer. Thx

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0nvm.. I tried wolframalpha. But only get two step by steps each day:(

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0I'll have to get the answer tomorrow.

RolyPoly
 one year ago
Best ResponseYou've already chosen the best response.0It would be better if you know how to solve it, instead of just relying on WolframAlpha.

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0eh, true. But lets be honest with ourselves, I'm never going to use this advanced of math in the future.

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0Honestly, I just need credits/passed classes

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0you can argue all you want, but it's true.

RolyPoly
 one year ago
Best ResponseYou've already chosen the best response.0Don't want to argue, just want to help you pass the course and you can learn how to solve it at the same time :)

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0can you just show me please? I'm 18 lessons behind:(

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0It would be a different story if I wasn't that behind

RolyPoly
 one year ago
Best ResponseYou've already chosen the best response.0\[\sqrt{x7x}=1\]\[\sqrt{x7}x=1\]\[\sqrt{x}7x=1\] Which one is your question?

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0like this @nikato dw:1388896983931:dw

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0the 2nd one @RolyPoly

nikato
 one year ago
Best ResponseYou've already chosen the best response.2so now u havedw:1388897108757:dw now square both sides

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0i know 9 is the solution

nikato
 one year ago
Best ResponseYou've already chosen the best response.2did u square both sides. and simplified it?

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0how do I simplify it?

nikato
 one year ago
Best ResponseYou've already chosen the best response.2dw:1388897450469:dwdoes that make sense?

nikato
 one year ago
Best ResponseYou've already chosen the best response.2subtract x and 7 on both sides so that the equation equal 0

nikato
 one year ago
Best ResponseYou've already chosen the best response.2dw:1388897800670:dw can u factor the right side?

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0can you show me? eheh

nikato
 one year ago
Best ResponseYou've already chosen the best response.2no, i dont think 9 is a solution. try pluggin it back into the origianl equation. it doesnt work

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0then you did it wrong. Ugh. Wolfram said it was 9

nikato
 one year ago
Best ResponseYou've already chosen the best response.2no, im for sure 9 is not an answer. it doesnt make sense. its one fo those^

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0@Krazete is he wrong or not?

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0sorry, nikato. I gotta make sure.

nikato
 one year ago
Best ResponseYou've already chosen the best response.2yea, its fine. whatever u feel is right

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0okayy,, it's just wolfram said the solution was 9. But I guess it's better to have something than nothing at all.

nikato
 one year ago
Best ResponseYou've already chosen the best response.2maybe u typed in the wrong equation in wolfrma

Krazete
 one year ago
Best ResponseYou've already chosen the best response.0Look at what Wolfram says under "input." Is it the same as your problem? It might've calculated √x instead of √(x+7). Parentheses are quite important.

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0nikato, what do I do next? Sorry for doubting you

nikato
 one year ago
Best ResponseYou've already chosen the best response.2dw:1388899779946:dw solve for x. did most of the work. should be easy for u. there are suppose to be 2 answers

nikato
 one year ago
Best ResponseYou've already chosen the best response.2no, 3. so now u want to find if there is anyextraneous answers

nikato
 one year ago
Best ResponseYou've already chosen the best response.2plug both back into the equation and see if they make sensedw:1388900195738:dw

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0ugh. How much more is there??

nikato
 one year ago
Best ResponseYou've already chosen the best response.2no, this is it. check if both of those equation are true. if they are not, then that "x" is extraneous

nikato
 one year ago
Best ResponseYou've already chosen the best response.2WAIT NO. its either 2 or 3. i helped plug in both in for x the first one is x=2 and the other is x=3

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0I did it in my calculator. How'd you get your answer?

nikato
 one year ago
Best ResponseYou've already chosen the best response.2no, thats not what i meant

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0I'm sorry, I still don't get how you got those answers. I got 5 and 1. 1 was correct. 5 was incorrect.

nikato
 one year ago
Best ResponseYou've already chosen the best response.2yes. so that means 3 is the extraneous answer. remember how we worked the problem, and got 2 and 3 as the naswer. however when u plug 3 back into the original equation u get 5 instead of 1. which means the answer doesnt "work" which we call an extraneous answer

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0so what is the answer???

nikato
 one year ago
Best ResponseYou've already chosen the best response.2becuz like i said ^ 3 is an extraneous solution

Emily778
 one year ago
Best ResponseYou've already chosen the best response.0so, I would put "x=2 only"?
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