A community for students.
Here's the question you clicked on:
 0 viewing
Emily778
 2 years ago
check for extraneous solutions.
sqrt x+7x=1
Please show step by step on how to do this. Thankyou.
Emily778
 2 years ago
check for extraneous solutions. sqrt x+7x=1 Please show step by step on how to do this. Thankyou.

This Question is Closed

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

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

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

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

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

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

RolyPoly
 2 years 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
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.0Honestly, I just need credits/passed classes

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

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

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

RolyPoly
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.0like this @nikato dw:1388896983931:dw

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

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

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

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

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

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

nikato
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.0then you did it wrong. Ugh. Wolfram said it was 9

nikato
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.0@Krazete is he wrong or not?

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

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

Emily778
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.2maybe u typed in the wrong equation in wolfrma

Krazete
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.0nikato, what do I do next? Sorry for doubting you

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

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

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

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

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

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

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

Emily778
 2 years ago
Best ResponseYou've already chosen the best response.0so, I would put "x=2 only"?
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.