6x^2+2x+21=0

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Solution for 6x^2+2x+21=0 equation:


Simplifying
6x2 + 2x + 21 = 0

Reorder the terms:
21 + 2x + 6x2 = 0

Solving
21 + 2x + 6x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
6 the coefficient of the squared term: 

Divide each side by '6'.
3.5 + 0.3333333333x + x2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + 0.3333333333x + -3.5 + x2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + 0.3333333333x + x2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + 0.3333333333x + x2 = 0 + -3.5
0.3333333333x + x2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
0.3333333333x + x2 = -3.5

The x term is 0.3333333333x.  Take half its coefficient (0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
0.3333333333x + 0.02777777779 + x2 = -3.5 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333x + x2 = -3.5 + 0.02777777779

Combine like terms: -3.5 + 0.02777777779 = -3.47222222221
0.02777777779 + 0.3333333333x + x2 = -3.47222222221

Factor a perfect square on the left side:
(x + 0.1666666667)(x + 0.1666666667) = -3.47222222221

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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