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

Sagot :

Panoyin
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}.
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