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anonymous
 3 years ago
Finding x intercepts for quadratic functions
anonymous
 3 years ago
Finding x intercepts for quadratic functions

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

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0do you know the formula? http://en.wikipedia.org/wiki/Quadratic_equation#Quadratic_formula

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

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0almost, a= 6 not 6x^2

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0that way you have a number :D

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0What happens to the x^2?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0well: 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.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Them 2 solutions got me lost..

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0dw:1360628346901:dw

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0it 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}}

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0i mean \[x_2= 1\frac{1}{\sqrt{6}}\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0ahem, yeah with 1 ... :)

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

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[12^2  4\cdot 6 \cdot 5 = 144  120 = 24\]

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

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

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0The square roots throw me off...

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\sqrt{24}=\sqrt{4\cdot 6} =\sqrt{4} \cdot \sqrt{6} = 2\sqrt{6}\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Ah ok got it thanks.!

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Do we do anything else to it?

anonymous
 3 years 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

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0hmm what are your choices?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0so it's the second one: \[\frac{6\pm \sqrt{6}}{6}\] it's basically what I told you but in a different form

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\frac{6\pm\sqrt{6}}{6} = 1 \pm \frac{\sqrt{6}}{6} = 1\pm \frac{1}{\sqrt{6}}\]
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