use the quadratic formula to solve 7c^2 + 8c + 1 =0

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07-05-2015
Mathematics

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use the quadratic formula to solve 7c^2 + 8c + 1 =0

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Panoyin Panoyin · Answer 1 · 2015-05-07T02:40:33+02:00

7c² + 8c + 1 = 0
c = -(8) +/- √((8)² - 4(7)(1))
   2(7)
c = -8 +/- √(64 - 28)
   14
c = -8 +/- √(36)
14
c = -8 +/- 6
      14
c = -8 + 6    c = -8 - 6
   14    14
c = 2       c = -14
   14     14
c = ¹/₇    c = 1

The solution is equal to { 1, ¹/₇}.