-3.9x^2+6.8x-12=0

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Solution for -3.9x^2+6.8x-12=0 equation: 


Simplifying
-3.9x2 + 6.8x + -12 = 0

Reorder the terms:
-12 + 6.8x + -3.9x2 = 0

Solving
-12 + 6.8x + -3.9x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-3.9 the coefficient of the squared term: 

Divide each side by '-3.9'.
3.076923077 + -1.743589744x + x2 = 0

Move the constant term to the right:

Add '-3.076923077' to each side of the equation.
3.076923077 + -1.743589744x + -3.076923077 + x2 = 0 + -3.076923077

Reorder the terms:
3.076923077 + -3.076923077 + -1.743589744x + x2 = 0 + -3.076923077

Combine like terms: 3.076923077 + -3.076923077 = 0.000000000
0.000000000 + -1.743589744x + x2 = 0 + -3.076923077
-1.743589744x + x2 = 0 + -3.076923077

Combine like terms: 0 + -3.076923077 = -3.076923077
-1.743589744x + x2 = -3.076923077

The x term is -1.743589744x.  Take half its coefficient (-0.871794872).
Square it (0.7600262988) and add it to both sides.

Add '0.7600262988' to each side of the equation.
-1.743589744x + 0.7600262988 + x2 = -3.076923077 + 0.7600262988

Reorder the terms:
0.7600262988 + -1.743589744x + x2 = -3.076923077 + 0.7600262988

Combine like terms: -3.076923077 + 0.7600262988 = -2.3168967782
0.7600262988 + -1.743589744x + x2 = -2.3168967782

Factor a perfect square on the left side:
(x + -0.871794872)(x + -0.871794872) = -2.3168967782

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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