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

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Question 46794: Solve the equation by completing the square.
21d%5E2%2B34d%2B8=0
Answer by atif.muhammad(135) About Me  (Show Source):
You can put this solution on YOUR website!

21d%5E2%2B34d%2B8=0

d%5E2%2B%2834%2F21%29d%2B8%2F21=0

%28d%2B%2834%2F42%29%29%5E2+-+%2834%2F42%29%5E2+%2B+8%2F21=0

%28d%2B%2834%2F42%29%29%5E2+-+%28121%2F441%29=0

%28d%2B%2834%2F42%29%29%5E2+=+%28121%2F441%29

(d+(34/42)) = +-(11/21)

(d+(17/21)) = +-(11/21)

(d = (-17 +-11/21)

d=+-4%2F3+and+-2%2F7