SOLUTION: Solve the equation by completing the square. {{{21d^2+34d+8=0}}}

Algebra ->  Equations -> SOLUTION: Solve the equation by completing the square. {{{21d^2+34d+8=0}}}      Log On


   

Question 48444: Solve the equation by completing the square.
21d%5E2%2B34d%2B8=0
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
21d^2 + 34d + 8 = 0
d^2 + 34d/21 = -8/21
(d + 17/21)^2 = -168/441 + 289/441 = 121/441
d + 17/21 = +- 11/21
d = -17/21 +- 11/21
d = (-17 +- 11)/21