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gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0I need help on finding the x intercept on this quadratic function, dw:1360627184057:dw

Marx
 one year ago
Best ResponseYou've already chosen the best response.2do you know the formula? http://en.wikipedia.org/wiki/Quadratic_equation#Quadratic_formula

gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0Ok, so I solve it like this? dw:1360627636615:dw

Marx
 one year ago
Best ResponseYou've already chosen the best response.2that way you have a number :D

gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0What happens to the x^2?

Marx
 one year ago
Best ResponseYou've already chosen the best response.2well: a,b and c are the coefficients so there's no need for x's. check the formula again. so you should have two solutions.

gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0Them 2 solutions got me lost..

Marx
 one year ago
Best ResponseYou've already chosen the best response.2it goes like this: \[x_{1,2} =\frac{12\pm \sqrt{12^24\cdot 6 \cdot 5}}{6\cdot 2} = 1\pm \frac{\sqrt{24}}{12}=1\pm\frac{2\sqrt{6}}{12}=1\pm\frac{1}{\sqrt6}\] so we have : \[x_1 = 1+\frac{1}{\sqrt{6}}\] and x_2 = 1\frac{1}{\sqrt{6}}

Marx
 one year ago
Best ResponseYou've already chosen the best response.2i mean \[x_2= 1\frac{1}{\sqrt{6}}\]

Marx
 one year ago
Best ResponseYou've already chosen the best response.2ahem, yeah with 1 ... :)

gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0How did you get the\[\sqrt{24}\] ?

Marx
 one year ago
Best ResponseYou've already chosen the best response.2\[12^2  4\cdot 6 \cdot 5 = 144  120 = 24\]

gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0Ah, ok I was thinking 12*12 = 120 instead of 144. My bad,

gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0But then how did \[2\sqrt{6}\] come in?

gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0The square roots throw me off...

Marx
 one year ago
Best ResponseYou've already chosen the best response.2\[\sqrt{24}=\sqrt{4\cdot 6} =\sqrt{4} \cdot \sqrt{6} = 2\sqrt{6}\]

gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0Do we do anything else to it?

gjhfdfg
 one year ago
Best ResponseYou've already chosen the best response.0Is there anything else I should do to the answer(s)? None of them match my answer choices

Marx
 one year ago
Best ResponseYou've already chosen the best response.2hmm what are your choices?

Marx
 one year ago
Best ResponseYou've already chosen the best response.2so it's the second one: \[\frac{6\pm \sqrt{6}}{6}\] it's basically what I told you but in a different form

Marx
 one year ago
Best ResponseYou've already chosen the best response.2\[\frac{6\pm\sqrt{6}}{6} = 1 \pm \frac{\sqrt{6}}{6} = 1\pm \frac{1}{\sqrt{6}}\]
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