=51.68-(14.4x)-25.36x^2

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Solution for =51.68-(14.4x)-25.36x^2 equation:


Simplifying
0 = 51.68 + -1(14.4x) + -25.36x2

Remove parenthesis around (14.4x)
0 = 51.68 + -1 * 14.4x + -25.36x2

Multiply -1 * 14.4
0 = 51.68 + -14.4x + -25.36x2

Solving
0 = 51.68 + -14.4x + -25.36x2

Solving for variable 'x'.

Combine like terms: 0 + -51.68 = -51.68
-51.68 + 14.4x + 25.36x2 = 51.68 + -14.4x + -25.36x2 + -51.68 + 14.4x + 25.36x2

Reorder the terms:
-51.68 + 14.4x + 25.36x2 = 51.68 + -51.68 + -14.4x + 14.4x + -25.36x2 + 25.36x2

Combine like terms: 51.68 + -51.68 = 0.00
-51.68 + 14.4x + 25.36x2 = 0.00 + -14.4x + 14.4x + -25.36x2 + 25.36x2
-51.68 + 14.4x + 25.36x2 = -14.4x + 14.4x + -25.36x2 + 25.36x2

Combine like terms: -14.4x + 14.4x = 0.0
-51.68 + 14.4x + 25.36x2 = 0.0 + -25.36x2 + 25.36x2
-51.68 + 14.4x + 25.36x2 = -25.36x2 + 25.36x2

Combine like terms: -25.36x2 + 25.36x2 = 0.00
-51.68 + 14.4x + 25.36x2 = 0.00

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

Divide each side by '25.36'.
-2.03785489 + 0.5678233438x + x2 = 0

Move the constant term to the right:

Add '2.03785489' to each side of the equation.
-2.03785489 + 0.5678233438x + 2.03785489 + x2 = 0 + 2.03785489

Reorder the terms:
-2.03785489 + 2.03785489 + 0.5678233438x + x2 = 0 + 2.03785489

Combine like terms: -2.03785489 + 2.03785489 = 0.00000000
0.00000000 + 0.5678233438x + x2 = 0 + 2.03785489
0.5678233438x + x2 = 0 + 2.03785489

Combine like terms: 0 + 2.03785489 = 2.03785489
0.5678233438x + x2 = 2.03785489

The x term is 0.5678233438x.  Take half its coefficient (0.2839116719).
Square it (0.08060583744) and add it to both sides.

Add '0.08060583744' to each side of the equation.
0.5678233438x + 0.08060583744 + x2 = 2.03785489 + 0.08060583744

Reorder the terms:
0.08060583744 + 0.5678233438x + x2 = 2.03785489 + 0.08060583744

Combine like terms: 2.03785489 + 0.08060583744 = 2.11846072744
0.08060583744 + 0.5678233438x + x2 = 2.11846072744

Factor a perfect square on the left side:
(x + 0.2839116719)(x + 0.2839116719) = 2.11846072744

Calculate the square root of the right side: 1.455493294

Break this problem into two subproblems by setting 
(x + 0.2839116719) equal to 1.455493294 and -1.455493294.

Subproblem 1

x + 0.2839116719 = 1.455493294 Simplifying x + 0.2839116719 = 1.455493294 Reorder the terms: 0.2839116719 + x = 1.455493294 Solving 0.2839116719 + x = 1.455493294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2839116719' to each side of the equation. 0.2839116719 + -0.2839116719 + x = 1.455493294 + -0.2839116719 Combine like terms: 0.2839116719 + -0.2839116719 = 0.0000000000 0.0000000000 + x = 1.455493294 + -0.2839116719 x = 1.455493294 + -0.2839116719 Combine like terms: 1.455493294 + -0.2839116719 = 1.1715816221 x = 1.1715816221 Simplifying x = 1.1715816221

Subproblem 2

x + 0.2839116719 = -1.455493294 Simplifying x + 0.2839116719 = -1.455493294 Reorder the terms: 0.2839116719 + x = -1.455493294 Solving 0.2839116719 + x = -1.455493294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2839116719' to each side of the equation. 0.2839116719 + -0.2839116719 + x = -1.455493294 + -0.2839116719 Combine like terms: 0.2839116719 + -0.2839116719 = 0.0000000000 0.0000000000 + x = -1.455493294 + -0.2839116719 x = -1.455493294 + -0.2839116719 Combine like terms: -1.455493294 + -0.2839116719 = -1.7394049659 x = -1.7394049659 Simplifying x = -1.7394049659

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1715816221, -1.7394049659}

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