0.0002x^2-0.316x+120.9=0

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Solution for 0.0002x^2-0.316x+120.9=0 equation:


Simplifying
0.0002x2 + -0.316x + 120.9 = 0

Reorder the terms:
120.9 + -0.316x + 0.0002x2 = 0

Solving
120.9 + -0.316x + 0.0002x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.0002'.
604500 + -1580x + x2 = 0

Move the constant term to the right:

Add '-604500' to each side of the equation.
604500 + -1580x + -604500 + x2 = 0 + -604500

Reorder the terms:
604500 + -604500 + -1580x + x2 = 0 + -604500

Combine like terms: 604500 + -604500 = 0
0 + -1580x + x2 = 0 + -604500
-1580x + x2 = 0 + -604500

Combine like terms: 0 + -604500 = -604500
-1580x + x2 = -604500

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 = -604500 + 624100

Reorder the terms:
624100 + -1580x + x2 = -604500 + 624100

Combine like terms: -604500 + 624100 = 19600
624100 + -1580x + x2 = 19600

Factor a perfect square on the left side:
(x + -790)(x + -790) = 19600

Calculate the square root of the right side: 140

Break this problem into two subproblems by setting 
(x + -790) equal to 140 and -140.

Subproblem 1

x + -790 = 140 Simplifying x + -790 = 140 Reorder the terms: -790 + x = 140 Solving -790 + x = 140 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 = 140 + 790 Combine like terms: -790 + 790 = 0 0 + x = 140 + 790 x = 140 + 790 Combine like terms: 140 + 790 = 930 x = 930 Simplifying x = 930

Subproblem 2

x + -790 = -140 Simplifying x + -790 = -140 Reorder the terms: -790 + x = -140 Solving -790 + x = -140 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 = -140 + 790 Combine like terms: -790 + 790 = 0 0 + x = -140 + 790 x = -140 + 790 Combine like terms: -140 + 790 = 650 x = 650 Simplifying x = 650

Solution

The solution to the problem is based on the solutions from the subproblems. x = {930, 650}

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