-.0128x^2+x+220=0

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Solution for -.0128x^2+x+220=0 equation:


Simplifying
-0.0128x2 + x + 220 = 0

Reorder the terms:
220 + x + -0.0128x2 = 0

Solving
220 + x + -0.0128x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.0128 the coefficient of the squared term: 

Divide each side by '-0.0128'.
-17187.5 + -78.125x + x2 = 0

Move the constant term to the right:

Add '17187.5' to each side of the equation.
-17187.5 + -78.125x + 17187.5 + x2 = 0 + 17187.5

Reorder the terms:
-17187.5 + 17187.5 + -78.125x + x2 = 0 + 17187.5

Combine like terms: -17187.5 + 17187.5 = 0.0
0.0 + -78.125x + x2 = 0 + 17187.5
-78.125x + x2 = 0 + 17187.5

Combine like terms: 0 + 17187.5 = 17187.5
-78.125x + x2 = 17187.5

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.
-78.125x + 0.25 + x2 = 17187.5 + 0.25

Reorder the terms:
0.25 + -78.125x + x2 = 17187.5 + 0.25

Combine like terms: 17187.5 + 0.25 = 17187.75
0.25 + -78.125x + x2 = 17187.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 17187.75

Calculate the square root of the right side: 131.10205948

Break this problem into two subproblems by setting 
(x + 0.5) equal to 131.10205948 and -131.10205948.

Subproblem 1

x + 0.5 = 131.10205948 Simplifying x + 0.5 = 131.10205948 Reorder the terms: 0.5 + x = 131.10205948 Solving 0.5 + x = 131.10205948 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 = 131.10205948 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 131.10205948 + -0.5 x = 131.10205948 + -0.5 Combine like terms: 131.10205948 + -0.5 = 130.60205948 x = 130.60205948 Simplifying x = 130.60205948

Subproblem 2

x + 0.5 = -131.10205948 Simplifying x + 0.5 = -131.10205948 Reorder the terms: 0.5 + x = -131.10205948 Solving 0.5 + x = -131.10205948 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 = -131.10205948 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -131.10205948 + -0.5 x = -131.10205948 + -0.5 Combine like terms: -131.10205948 + -0.5 = -131.60205948 x = -131.60205948 Simplifying x = -131.60205948

Solution

The solution to the problem is based on the solutions from the subproblems. x = {130.60205948, -131.60205948}

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