Answer :
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}.
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}.