A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
How do I do 7x^2 + x + 2 = 0 by the quadratic formula.
Thanks for your help in advance!
anonymous
 one year ago
How do I do 7x^2 + x + 2 = 0 by the quadratic formula. Thanks for your help in advance!

This Question is Closed

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2do you know the quadratic formula?

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2ax^2 + bx + c = 0 7x^2 + 1x + 2 = 0

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2use those values for a, b , and c

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2yep.. \[x=\frac{ b \pm \sqrt{b^24ac} }{ 2a }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1441589861398:dw

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2the stuff under the square root turns out to be negative, so no real solutions to this one, less you want the complex roots

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I do not know how to solve this from start to finish.

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2you have it right so far with the drawing, just have to simplify it down now if needed.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I tried it but when it got down to the imaginary number it got confusing.

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2\[x=\frac{ 1 \pm \sqrt{55}}{ 14 }\] \[x=\frac{ 1 }{ 14 }\pm \frac{ \sqrt{55} *\sqrt{1}}{ 14 }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1441590203726:dw

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2just have to remember...\[i=\sqrt{1}\] put in i for that then solve normally

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2\[x =\frac{ 1 }{ 14 }+\frac{ \sqrt{55} }{ 14 }*i ~~~~~or~~~~~x =\frac{ 1 }{ 14 }\frac{ \sqrt{55} }{ 14 }*i\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh thank you I never knew what a imaginary number was.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Does it simplified more is that the final answer?

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2welcome, If you have to know nothing else about imaginary numbers, then just remember \[i^2=1~~~~or~~~~~i=\sqrt{1}\]

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2that is all you can do to make it more simple looking

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thanks so much! Did the i get in the problem because square root of 55 is a decimal?

DanJS
 one year ago
Best ResponseYou've already chosen the best response.2no, because the quadratic formula turned out to have a negative number in the square root, remember you cant take the square root of a number smaller than zero

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh okay I see how it got in then. Thanks for your time and help!
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.