5.6x^2+40x+400=0

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Solution for 5.6x^2+40x+400=0 equation:


Simplifying
5.6x2 + 40x + 400 = 0

Reorder the terms:
400 + 40x + 5.6x2 = 0

Solving
400 + 40x + 5.6x2 = 0

Solving for variable 'x'.

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

Divide each side by '5.6'.
71.42857143 + 7.142857143x + x2 = 0

Move the constant term to the right:

Add '-71.42857143' to each side of the equation.
71.42857143 + 7.142857143x + -71.42857143 + x2 = 0 + -71.42857143

Reorder the terms:
71.42857143 + -71.42857143 + 7.142857143x + x2 = 0 + -71.42857143

Combine like terms: 71.42857143 + -71.42857143 = 0.00000000
0.00000000 + 7.142857143x + x2 = 0 + -71.42857143
7.142857143x + x2 = 0 + -71.42857143

Combine like terms: 0 + -71.42857143 = -71.42857143
7.142857143x + x2 = -71.42857143

The x term is 7.142857143x.  Take half its coefficient (3.571428572).
Square it (12.75510204) and add it to both sides.

Add '12.75510204' to each side of the equation.
7.142857143x + 12.75510204 + x2 = -71.42857143 + 12.75510204

Reorder the terms:
12.75510204 + 7.142857143x + x2 = -71.42857143 + 12.75510204

Combine like terms: -71.42857143 + 12.75510204 = -58.67346939
12.75510204 + 7.142857143x + x2 = -58.67346939

Factor a perfect square on the left side:
(x + 3.571428572)(x + 3.571428572) = -58.67346939

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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