0=x^2+10.95x+12.4

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Solution for 0=x^2+10.95x+12.4 equation:


Simplifying
0 = x2 + 10.95x + 12.4

Reorder the terms:
0 = 12.4 + 10.95x + x2

Solving
0 = 12.4 + 10.95x + x2

Solving for variable 'x'.

Combine like terms: 0 + -12.4 = -12.4
-12.4 + -10.95x + -1x2 = 12.4 + 10.95x + x2 + -12.4 + -10.95x + -1x2

Reorder the terms:
-12.4 + -10.95x + -1x2 = 12.4 + -12.4 + 10.95x + -10.95x + x2 + -1x2

Combine like terms: 12.4 + -12.4 = 0.0
-12.4 + -10.95x + -1x2 = 0.0 + 10.95x + -10.95x + x2 + -1x2
-12.4 + -10.95x + -1x2 = 10.95x + -10.95x + x2 + -1x2

Combine like terms: 10.95x + -10.95x = 0.00
-12.4 + -10.95x + -1x2 = 0.00 + x2 + -1x2
-12.4 + -10.95x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-12.4 + -10.95x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
12.4 + 10.95x + x2 = 0

Move the constant term to the right:

Add '-12.4' to each side of the equation.
12.4 + 10.95x + -12.4 + x2 = 0 + -12.4

Reorder the terms:
12.4 + -12.4 + 10.95x + x2 = 0 + -12.4

Combine like terms: 12.4 + -12.4 = 0.0
0.0 + 10.95x + x2 = 0 + -12.4
10.95x + x2 = 0 + -12.4

Combine like terms: 0 + -12.4 = -12.4
10.95x + x2 = -12.4

The x term is 10.95x.  Take half its coefficient (5.475).
Square it (29.975625) and add it to both sides.

Add '29.975625' to each side of the equation.
10.95x + 29.975625 + x2 = -12.4 + 29.975625

Reorder the terms:
29.975625 + 10.95x + x2 = -12.4 + 29.975625

Combine like terms: -12.4 + 29.975625 = 17.575625
29.975625 + 10.95x + x2 = 17.575625

Factor a perfect square on the left side:
(x + 5.475)(x + 5.475) = 17.575625

Calculate the square root of the right side: 4.192329305

Break this problem into two subproblems by setting 
(x + 5.475) equal to 4.192329305 and -4.192329305.

Subproblem 1

x + 5.475 = 4.192329305 Simplifying x + 5.475 = 4.192329305 Reorder the terms: 5.475 + x = 4.192329305 Solving 5.475 + x = 4.192329305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.475' to each side of the equation. 5.475 + -5.475 + x = 4.192329305 + -5.475 Combine like terms: 5.475 + -5.475 = 0.000 0.000 + x = 4.192329305 + -5.475 x = 4.192329305 + -5.475 Combine like terms: 4.192329305 + -5.475 = -1.282670695 x = -1.282670695 Simplifying x = -1.282670695

Subproblem 2

x + 5.475 = -4.192329305 Simplifying x + 5.475 = -4.192329305 Reorder the terms: 5.475 + x = -4.192329305 Solving 5.475 + x = -4.192329305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.475' to each side of the equation. 5.475 + -5.475 + x = -4.192329305 + -5.475 Combine like terms: 5.475 + -5.475 = 0.000 0.000 + x = -4.192329305 + -5.475 x = -4.192329305 + -5.475 Combine like terms: -4.192329305 + -5.475 = -9.667329305 x = -9.667329305 Simplifying x = -9.667329305

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.282670695, -9.667329305}

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