lauraana lauraana
  • 16-02-2016
  • Mathematics
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r . . V w l U i. a v w. v . Una It 3 A 1-

r V w l U i a v w v Una It 3 A 1 class=

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Leader
Leader Leader
  • 16-02-2016
[tex]7x^2 + 21 = 0\\\\7x^2 = -21\\\\x^2 = -\frac{21}{7}\\\\x^2 = -3\\\\x = \sqrt{-3}\\\\\boxed{\bf{x = i\sqrt{3}}}\\\\\boxed{\bf{x=-i\sqrt{3}}}[/tex]
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