x+155x(-x)=12

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Solution for x+155x(-x)=12 equation:


Simplifying
x + 155x(-1x) = 12

Remove parenthesis around (-1x)
x + 155x * -1x = 12

Reorder the terms for easier multiplication:
x + 155 * -1x * x = 12

Multiply 155 * -1
x + -155x * x = 12

Multiply x * x
x + -155x2 = 12

Solving
x + -155x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + x + -155x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + x + -155x2 = 0

Begin completing the square.  Divide all terms by
-155 the coefficient of the squared term: 

Divide each side by '-155'.
0.07741935484 + -0.006451612903x + x2 = 0

Move the constant term to the right:

Add '-0.07741935484' to each side of the equation.
0.07741935484 + -0.006451612903x + -0.07741935484 + x2 = 0 + -0.07741935484

Reorder the terms:
0.07741935484 + -0.07741935484 + -0.006451612903x + x2 = 0 + -0.07741935484

Combine like terms: 0.07741935484 + -0.07741935484 = 0.00000000000
0.00000000000 + -0.006451612903x + x2 = 0 + -0.07741935484
-0.006451612903x + x2 = 0 + -0.07741935484

Combine like terms: 0 + -0.07741935484 = -0.07741935484
-0.006451612903x + x2 = -0.07741935484

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.006451612903x + 0.25 + x2 = -0.07741935484 + 0.25

Reorder the terms:
0.25 + -0.006451612903x + x2 = -0.07741935484 + 0.25

Combine like terms: -0.07741935484 + 0.25 = 0.17258064516
0.25 + -0.006451612903x + x2 = 0.17258064516

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.17258064516

Calculate the square root of the right side: 0.415428267

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.415428267 and -0.415428267.

Subproblem 1

x + 0.5 = 0.415428267 Simplifying x + 0.5 = 0.415428267 Reorder the terms: 0.5 + x = 0.415428267 Solving 0.5 + x = 0.415428267 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.415428267 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.415428267 + -0.5 x = 0.415428267 + -0.5 Combine like terms: 0.415428267 + -0.5 = -0.084571733 x = -0.084571733 Simplifying x = -0.084571733

Subproblem 2

x + 0.5 = -0.415428267 Simplifying x + 0.5 = -0.415428267 Reorder the terms: 0.5 + x = -0.415428267 Solving 0.5 + x = -0.415428267 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.415428267 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.415428267 + -0.5 x = -0.415428267 + -0.5 Combine like terms: -0.415428267 + -0.5 = -0.915428267 x = -0.915428267 Simplifying x = -0.915428267

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.084571733, -0.915428267}

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