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  • 17-06-2015
  • Mathematics
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using the quadratic formula to solve 7x^2-x-7=0

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Panoyin
Panoyin Panoyin
  • 18-06-2015
[tex]7x^{2} - x - 7 = 0[/tex]
[tex]x = \frac{-(-1) \± \sqrt{(-1)^{2} - 4(7)(-7)}}{2(7)}[/tex]
[tex]x = \frac{1 \± \sqrt{1 + 196}}{14}[/tex]
[tex]x = \frac{1 \± \sqrt{197}}{14}[/tex]
[tex]x = \frac{1 + \sqrt{197}}{14}[/tex]    [tex]or[/tex]    [tex]x = \frac{1 - \sqrt{197}}{14}[/tex]
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