Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
andriod09
Group Title
Need help on Quadratic equations please!
The equation is on the comments.
 2 years ago
 2 years ago
andriod09 Group Title
Need help on Quadratic equations please! The equation is on the comments.
 2 years ago
 2 years ago

This Question is Closed

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
\[4x^{2}+9x=0\] i know that the answer is: \[x=\frac{ 9\pm \sqrt{814(4)(2)} }{ 8 }\]
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
Much easier to solve your problem would be to factor out an x,\[x(4x+9)=0\]now you have two solutions,\[x=0\]and\[4x+9=0\]\[4x=9\]\[x=\frac{9}{4}\]and you get
 2 years ago

imron07 Group TitleBest ResponseYou've already chosen the best response.0
The equation is correct. But you put innocent "2" instead of "0" for c.
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
huh? the thing messed up, give me a sec
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
Well, then you can do the following:\[x_{1/2}=\frac{9 \pm \sqrt{9^24*4*0}}{2*4}\]simplifying that you get,\[x_{1/2}=\frac{ 9 \pm 9 }{ 8 }\]Compute the rest
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
I have to use: \[ax^{2}+bx+c=0\] and i have to use: \[x=\frac{ b\pm \sqrt{b^{2}4ac} }{ 2a }\]
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
Yes.. that is what I have used. Just make c=0, and you will get the same result as I have.
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
but c = 2... thats what the answer says.
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
Well then you have given us a wrong problem\[4x^2+9x=0\]does not have a c in it..
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
my bad... /facepalm its: \[4x^{2}+9x+2=0\]
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
@gezimbasha
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
Hehe, no worries. Now you have to use the formula you input\[x_{1/2}=\frac{9 \pm \sqrt{9^24*4*2}}{2*4}\]compute the values inside the square root first\[x_{1/2}=\frac{9 \pm \sqrt{81 32}}{8}\]and complete calculation\[x_{1/2}=\frac{9 \pm 7}{8}\] and you get,\[x_1= 2\]\[x_2=\frac{1}{4}\]
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
where did you get \[x _{1/2} \]
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
That just means that there are two solutions we will get from the equation. Its just mathematical notation. I am used to writing it like that. Don't worry, you can write just x, it will be fine.
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
im only in high school. :/ :L
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
Yeah I figured. The quadratic equations are studied extensively in high school. You're doing good tho. Might want to reconsider your profile picture heh ;)
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
it says i don't hate math. open my profile and look at the white! everyone says that. lol do you not see the white scribble on the \[^{don't}\] I hate math
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
Oh.. then I owe you an apology. XD.
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
Its okay. I need to make it bigger anyway. lol. Thanks tho.
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
You're welcome man. Anytime!
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
I gave you a medal. dont for get to give one back~ ;)
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
Hey, my bad, my first day over here.
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
what do you mean?
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
This is my first day in open study, so I'm still getting used to the medals and stuff.
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
how would i set up: \[3x^{2}+11x+5=0\] and oh. i didn't know
 2 years ago

gezimbasha Group TitleBest ResponseYou've already chosen the best response.1
Same principle, replace a=3, b=11, and c=5.
 2 years ago

andriod09 Group TitleBest ResponseYou've already chosen the best response.1
i mean in the fraction form
 2 years ago
See more questions >>>
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.