6x^2+5x+21=0

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Solution for 6x^2+5x+21=0 equation:


Simplifying
6x2 + 5x + 21 = 0

Reorder the terms:
21 + 5x + 6x2 = 0

Solving
21 + 5x + 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 + 0.8333333333x + x2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + 0.8333333333x + -3.5 + x2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + 0.8333333333x + x2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + 0.8333333333x + x2 = 0 + -3.5
0.8333333333x + x2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
0.8333333333x + x2 = -3.5

The x term is 0.8333333333x.  Take half its coefficient (0.4166666667).
Square it (0.1736111111) and add it to both sides.

Add '0.1736111111' to each side of the equation.
0.8333333333x + 0.1736111111 + x2 = -3.5 + 0.1736111111

Reorder the terms:
0.1736111111 + 0.8333333333x + x2 = -3.5 + 0.1736111111

Combine like terms: -3.5 + 0.1736111111 = -3.3263888889
0.1736111111 + 0.8333333333x + x2 = -3.3263888889

Factor a perfect square on the left side:
(x + 0.4166666667)(x + 0.4166666667) = -3.3263888889

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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