alyssasimeon alyssasimeon

06-05-2015
Mathematics

Answered

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

Answer :

Panoyin Panoyin

06-05-2015

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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