x-x^2=.18

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Solution for x-x^2=.18 equation:


Simplifying
x + -1x2 = 0.18

Solving
x + -1x2 = 0.18

Solving for variable 'x'.

Reorder the terms:
-0.18 + x + -1x2 = 0.18 + -0.18

Combine like terms: 0.18 + -0.18 = 0.00
-0.18 + x + -1x2 = 0.00

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
0.18 + -1x + x2 = 0.00

Move the constant term to the right:

Add '-0.18' to each side of the equation.
0.18 + -1x + -0.18 + x2 = 0.00 + -0.18

Reorder the terms:
0.18 + -0.18 + -1x + x2 = 0.00 + -0.18

Combine like terms: 0.18 + -0.18 = 0.00
0.00 + -1x + x2 = 0.00 + -0.18
-1x + x2 = 0.00 + -0.18

Combine like terms: 0.00 + -0.18 = -0.18
-1x + x2 = -0.18

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.
-1x + 0.25 + x2 = -0.18 + 0.25

Reorder the terms:
0.25 + -1x + x2 = -0.18 + 0.25

Combine like terms: -0.18 + 0.25 = 0.07
0.25 + -1x + x2 = 0.07

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.07

Calculate the square root of the right side: 0.264575131

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.264575131 and -0.264575131.

Subproblem 1

x + 0.5 = 0.264575131 Simplifying x + 0.5 = 0.264575131 Reorder the terms: 0.5 + x = 0.264575131 Solving 0.5 + x = 0.264575131 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 = 0.264575131 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.264575131 + -0.5 x = 0.264575131 + -0.5 Combine like terms: 0.264575131 + -0.5 = -0.235424869 x = -0.235424869 Simplifying x = -0.235424869

Subproblem 2

x + 0.5 = -0.264575131 Simplifying x + 0.5 = -0.264575131 Reorder the terms: 0.5 + x = -0.264575131 Solving 0.5 + x = -0.264575131 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 = -0.264575131 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.264575131 + -0.5 x = -0.264575131 + -0.5 Combine like terms: -0.264575131 + -0.5 = -0.764575131 x = -0.764575131 Simplifying x = -0.764575131

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.235424869, -0.764575131}

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