.0002x^2-.316x-127.9=4

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Solution for .0002x^2-.316x-127.9=4 equation:


Simplifying
0.0002x2 + -0.316x + -127.9 = 4

Reorder the terms:
-127.9 + -0.316x + 0.0002x2 = 4

Solving
-127.9 + -0.316x + 0.0002x2 = 4

Solving for variable 'x'.

Reorder the terms:
-127.9 + -4 + -0.316x + 0.0002x2 = 4 + -4

Combine like terms: -127.9 + -4 = -131.9
-131.9 + -0.316x + 0.0002x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-131.9 + -0.316x + 0.0002x2 = 0

Begin completing the square.  Divide all terms by
0.0002 the coefficient of the squared term: 

Divide each side by '0.0002'.
-659500 + -1580x + x2 = 0

Move the constant term to the right:

Add '659500' to each side of the equation.
-659500 + -1580x + 659500 + x2 = 0 + 659500

Reorder the terms:
-659500 + 659500 + -1580x + x2 = 0 + 659500

Combine like terms: -659500 + 659500 = 0
0 + -1580x + x2 = 0 + 659500
-1580x + x2 = 0 + 659500

Combine like terms: 0 + 659500 = 659500
-1580x + x2 = 659500

The x term is -1580x.  Take half its coefficient (-790).
Square it (624100) and add it to both sides.

Add '624100' to each side of the equation.
-1580x + 624100 + x2 = 659500 + 624100

Reorder the terms:
624100 + -1580x + x2 = 659500 + 624100

Combine like terms: 659500 + 624100 = 1283600
624100 + -1580x + x2 = 1283600

Factor a perfect square on the left side:
(x + -790)(x + -790) = 1283600

Calculate the square root of the right side: 1132.960723061

Break this problem into two subproblems by setting 
(x + -790) equal to 1132.960723061 and -1132.960723061.

Subproblem 1

x + -790 = 1132.960723061 Simplifying x + -790 = 1132.960723061 Reorder the terms: -790 + x = 1132.960723061 Solving -790 + x = 1132.960723061 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '790' to each side of the equation. -790 + 790 + x = 1132.960723061 + 790 Combine like terms: -790 + 790 = 0 0 + x = 1132.960723061 + 790 x = 1132.960723061 + 790 Combine like terms: 1132.960723061 + 790 = 1922.960723061 x = 1922.960723061 Simplifying x = 1922.960723061

Subproblem 2

x + -790 = -1132.960723061 Simplifying x + -790 = -1132.960723061 Reorder the terms: -790 + x = -1132.960723061 Solving -790 + x = -1132.960723061 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '790' to each side of the equation. -790 + 790 + x = -1132.960723061 + 790 Combine like terms: -790 + 790 = 0 0 + x = -1132.960723061 + 790 x = -1132.960723061 + 790 Combine like terms: -1132.960723061 + 790 = -342.960723061 x = -342.960723061 Simplifying x = -342.960723061

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1922.960723061, -342.960723061}

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