12x^2+19x+21=0

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Solution for 12x^2+19x+21=0 equation:


Simplifying
12x2 + 19x + 21 = 0

Reorder the terms:
21 + 19x + 12x2 = 0

Solving
21 + 19x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
1.75 + 1.583333333x + x2 = 0

Move the constant term to the right:

Add '-1.75' to each side of the equation.
1.75 + 1.583333333x + -1.75 + x2 = 0 + -1.75

Reorder the terms:
1.75 + -1.75 + 1.583333333x + x2 = 0 + -1.75

Combine like terms: 1.75 + -1.75 = 0.00
0.00 + 1.583333333x + x2 = 0 + -1.75
1.583333333x + x2 = 0 + -1.75

Combine like terms: 0 + -1.75 = -1.75
1.583333333x + x2 = -1.75

The x term is 1.583333333x.  Take half its coefficient (0.7916666665).
Square it (0.6267361108) and add it to both sides.

Add '0.6267361108' to each side of the equation.
1.583333333x + 0.6267361108 + x2 = -1.75 + 0.6267361108

Reorder the terms:
0.6267361108 + 1.583333333x + x2 = -1.75 + 0.6267361108

Combine like terms: -1.75 + 0.6267361108 = -1.1232638892
0.6267361108 + 1.583333333x + x2 = -1.1232638892

Factor a perfect square on the left side:
(x + 0.7916666665)(x + 0.7916666665) = -1.1232638892

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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