9=.0002x^2-.316x+127.9

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Solution for 9=.0002x^2-.316x+127.9 equation:


Simplifying
9 = 0.0002x2 + -0.316x + 127.9

Reorder the terms:
9 = 127.9 + -0.316x + 0.0002x2

Solving
9 = 127.9 + -0.316x + 0.0002x2

Solving for variable 'x'.

Combine like terms: 9 + -127.9 = -118.9
-118.9 + 0.316x + -0.0002x2 = 127.9 + -0.316x + 0.0002x2 + -127.9 + 0.316x + -0.0002x2

Reorder the terms:
-118.9 + 0.316x + -0.0002x2 = 127.9 + -127.9 + -0.316x + 0.316x + 0.0002x2 + -0.0002x2

Combine like terms: 127.9 + -127.9 = 0.0
-118.9 + 0.316x + -0.0002x2 = 0.0 + -0.316x + 0.316x + 0.0002x2 + -0.0002x2
-118.9 + 0.316x + -0.0002x2 = -0.316x + 0.316x + 0.0002x2 + -0.0002x2

Combine like terms: -0.316x + 0.316x = 0.000
-118.9 + 0.316x + -0.0002x2 = 0.000 + 0.0002x2 + -0.0002x2
-118.9 + 0.316x + -0.0002x2 = 0.0002x2 + -0.0002x2

Combine like terms: 0.0002x2 + -0.0002x2 = 0.0000
-118.9 + 0.316x + -0.0002x2 = 0.0000

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

Divide each side by '-0.0002'.
594500 + -1580x + x2 = 0

Move the constant term to the right:

Add '-594500' to each side of the equation.
594500 + -1580x + -594500 + x2 = 0 + -594500

Reorder the terms:
594500 + -594500 + -1580x + x2 = 0 + -594500

Combine like terms: 594500 + -594500 = 0
0 + -1580x + x2 = 0 + -594500
-1580x + x2 = 0 + -594500

Combine like terms: 0 + -594500 = -594500
-1580x + x2 = -594500

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 = -594500 + 624100

Reorder the terms:
624100 + -1580x + x2 = -594500 + 624100

Combine like terms: -594500 + 624100 = 29600
624100 + -1580x + x2 = 29600

Factor a perfect square on the left side:
(x + -790)(x + -790) = 29600

Calculate the square root of the right side: 172.046505341

Break this problem into two subproblems by setting 
(x + -790) equal to 172.046505341 and -172.046505341.

Subproblem 1

x + -790 = 172.046505341 Simplifying x + -790 = 172.046505341 Reorder the terms: -790 + x = 172.046505341 Solving -790 + x = 172.046505341 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 = 172.046505341 + 790 Combine like terms: -790 + 790 = 0 0 + x = 172.046505341 + 790 x = 172.046505341 + 790 Combine like terms: 172.046505341 + 790 = 962.046505341 x = 962.046505341 Simplifying x = 962.046505341

Subproblem 2

x + -790 = -172.046505341 Simplifying x + -790 = -172.046505341 Reorder the terms: -790 + x = -172.046505341 Solving -790 + x = -172.046505341 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 = -172.046505341 + 790 Combine like terms: -790 + 790 = 0 0 + x = -172.046505341 + 790 x = -172.046505341 + 790 Combine like terms: -172.046505341 + 790 = 617.953494659 x = 617.953494659 Simplifying x = 617.953494659

Solution

The solution to the problem is based on the solutions from the subproblems. x = {962.046505341, 617.953494659}

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