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kevin8374
Group Title
solve for r
r^2+3r=8
Example r^2+3r=1
r=3+√13/2,3√13/2
 2 years ago
 2 years ago
kevin8374 Group Title
solve for r r^2+3r=8 Example r^2+3r=1 r=3+√13/2,3√13/2
 2 years ago
 2 years ago

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philips13 Group TitleBest ResponseYou've already chosen the best response.1
looks like the quadratic equation might help here
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
r^2 +3r 8 =0 a=1 b=3 c=8 Use the quadratic formula to get your answer(s) for x.
 2 years ago

kevin8374 Group TitleBest ResponseYou've already chosen the best response.0
The quadratic equation is where my problem lies
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
Do you know what the quadratic formula is?
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
http://0.tqn.com/d/create/1/0/i/9/9//Quadratic.formula.jpg
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
((1) +/ sqrt ((3)^2(4)(1)(8)))/((2)(1))
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
(1 +/ sqrt (41))/2 ***THAT MEANS*** x = (1 + sqrt(41))/2 x = (1  sqrt(41))/2
 2 years ago

kevin8374 Group TitleBest ResponseYou've already chosen the best response.0
Thanks so much
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
This is what you do whenever factoring is impossible.
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
Or if you're too lazy to factor :)... like I usually am LOL
 2 years ago

kevin8374 Group TitleBest ResponseYou've already chosen the best response.0
so how would i put x^2+7x=10 into the quadratic equation
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
Okay so your format is going to be ax^2+bx+c So with x^2+7x=10, you always always always get everything on the left side. You're setting it equal to zero. x^2+7x10=0 Now what are a, b, and c?
 2 years ago

kevin8374 Group TitleBest ResponseYou've already chosen the best response.0
sorry typed problem wrong x^2+7x10=0
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
k... so what do you think a, b, and c are?
 2 years ago

kevin8374 Group TitleBest ResponseYou've already chosen the best response.0
a is 1 b is 7 c is 10
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
I'll ask you one now. x^2+2x+3 What is "a" in this case?
 2 years ago

kevin8374 Group TitleBest ResponseYou've already chosen the best response.0
my problem is keeping it all in order
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
Now if there's a term, say b=2 and you need to plug it into your formula, the first thing you're putting in is b. So how to do that: (2). So that will be a +2.
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
I understand. And I would recommend to do the problem in as many steps as you need to. And to slow down and pay close attention. I took an engineering problems course last quarter and I made a lot of mistakes when I didn't pay attention :)
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
You can try that problem and we'll compare answers if you want.
 2 years ago

kevin8374 Group TitleBest ResponseYou've already chosen the best response.0
ok is it 7+√89/2,7√89/2
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
That's what I got too. You know what you're doing!
 2 years ago

kevin8374 Group TitleBest ResponseYou've already chosen the best response.0
You have no idea how much you have helped me thanks again!!!!!
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
I'm glad :) So step 1: Get everything on the left side so that it's set equal to zero. step 2: write down what your a, b, and c values are step 3: plug in to the formula and go slow
 2 years ago

kevin8374 Group TitleBest ResponseYou've already chosen the best response.0
I truly cannot thank you enough I have been struggling for days
 2 years ago

brinethery Group TitleBest ResponseYou've already chosen the best response.2
I would recommend Paul's online notes as an alternative to your book. Most algebra books truly suck. http://tutorial.math.lamar.edu/Classes/Alg/SolveQuadraticEqnsII.aspx
 2 years ago
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