amarie032800 amarie032800

27-07-2016
Mathematics

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Solve: 25x2 − 36 = 0.

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Panoyin Panoyin

27-07-2016

25x² - 36 = 0
  25x² - 30x + 30x - 36 = 0
5x(5x) - 5x(6) + 6(5x) - 6(6) = 0
  5x(5x - 6) + 6(5x - 6) = 0
(5x + 6)(5x - 6) = 0
5x + 6 = 0 or 5x - 6 = 0
   - 6 - 6 + 6 + 6
5x = -6   5x = 6
5 5 5   5
x = -1.2 x = 1.2

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