A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
2x²  7 = 4x
Where are a, b, and c in this equation? How do I solve this with the quadratic equation?
anonymous
 one year ago
2x²  7 = 4x Where are a, b, and c in this equation? How do I solve this with the quadratic equation?

This Question is Closed

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.0remember, a standard quadratic equation is always in this form: \(a^{2}x+bx+c\) so you're going to need to manipulate this equation to set it to this formula

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Is a 2? Is b 4? Is C 7?

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.0we have this equation: 2x²  7 = 4x We need to rearrange it so that the x² part is positive. Therefore take the "2x²  7" to the other side of the equals sign and we get: 2x²  7 = 4x 0 = 2x² + 4x +7 Standard form is : ax² + bx + c = 0 Therefore match it up with your equation and we get: a = 2, b = 4 , c = 7 Which you said.. so you're correct ^_^!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0How do I solve this?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0use this formula\[x=\frac{ b \pm \sqrt{b^24ac} }{ 2a }\]

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.0yeah use the quadratic formula (as stated by surjithayer) to solve for x :)

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.0not quite we know a = 2, b = 4 and c = 7 plug these values into the quadratic formula: dw:1433428335720:dw

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.0note: we cannot square root a negative number. Therefore, there will be no solution... What i mean by this is that in this part here: dw:1433428482052:dw And we can't square root 40. Therefore x will have no solution

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I thought that when the numerator says "\[\pm\]", you were supposed to change the number to a positive whenever you square rooted it.

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.0hmm.. the plus and minus sign, means that you can get TWO solutions... for x. You want to concentrate on what is happening INSIDE the square root sign: dw:1433430575846:dw plug it into the calculator and tell me if you get an answer :)

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.0you should get a math error. Why? Because we can't square root a negative number.
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.