-3.5x^2-4x-5=0

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Solution for -3.5x^2-4x-5=0 equation: 


Simplifying
-3.5x2 + -4x + -5 = 0

Reorder the terms:
-5 + -4x + -3.5x2 = 0

Solving
-5 + -4x + -3.5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-3.5 the coefficient of the squared term: 

Divide each side by '-3.5'.
1.428571429 + 1.142857143x + x2 = 0

Move the constant term to the right:

Add '-1.428571429' to each side of the equation.
1.428571429 + 1.142857143x + -1.428571429 + x2 = 0 + -1.428571429

Reorder the terms:
1.428571429 + -1.428571429 + 1.142857143x + x2 = 0 + -1.428571429

Combine like terms: 1.428571429 + -1.428571429 = 0.000000000
0.000000000 + 1.142857143x + x2 = 0 + -1.428571429
1.142857143x + x2 = 0 + -1.428571429

Combine like terms: 0 + -1.428571429 = -1.428571429
1.142857143x + x2 = -1.428571429

The x term is 1.142857143x.  Take half its coefficient (0.5714285715).
Square it (0.3265306123) and add it to both sides.

Add '0.3265306123' to each side of the equation.
1.142857143x + 0.3265306123 + x2 = -1.428571429 + 0.3265306123

Reorder the terms:
0.3265306123 + 1.142857143x + x2 = -1.428571429 + 0.3265306123

Combine like terms: -1.428571429 + 0.3265306123 = -1.1020408167
0.3265306123 + 1.142857143x + x2 = -1.1020408167

Factor a perfect square on the left side:
(x + 0.5714285715)(x + 0.5714285715) = -1.1020408167

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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