anonymous
  • anonymous
Quadratic formula. I can't seem to figure it out. I'll become a fan and give a medal
Mathematics
chestercat
  • chestercat
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zepdrix
  • zepdrix
Do you have a specific example that we need to use the Formula on? :)
anonymous
  • anonymous
hold on i'm attaching a file
anonymous
  • anonymous
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zepdrix
  • zepdrix
\[\large\rm \color{green}{1}x^2+\color{orangered}{9}x+\color{royalblue}{10}=0\]And our formula is,\[\large\rm x=\frac{-\color{orangered}{b}\pm\sqrt{\color{orangered}{b}^2-4\color{green}{a}\color{royalblue}{c}}}{2\color{green}{a}}\]ya? :o Understand why I put a 1 on the x^2?
anonymous
  • anonymous
nope. I suck at geometry
anonymous
  • anonymous
A = 1 B = 9 C = 10
anonymous
  • anonymous
also remember that if B is a negative i.e -9 then it would be +b rather than -b at the start
anonymous
  • anonymous
\[\frac{-9\pm \sqrt{9^2-4*1*10} }{2*1 }\]
anonymous
  • anonymous
\[X _{1} = \frac{ -9+\sqrt{41} }{2 } X _{2} = \frac{ -9-\sqrt{41} }{ 2 }\]
anonymous
  • anonymous
Tbh @Lily2913 I don't understand any of that
anonymous
  • anonymous
ok it's B
anonymous
  • anonymous
-7.7, -1.3
anonymous
  • anonymous
Thank you so so so so much. I've literally been working on that problem for an hour
anonymous
  • anonymous
Quadratic formula gives you 2 results X1 and X2 so if you had put the above in your calculator you would have seen -7.7 and -1.3
anonymous
  • anonymous
I hope you get a hang of it before any exams you need to take that use it. :)
anonymous
  • anonymous
IKR currently i'm screwed

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