x^2+1.8x-.1685=0

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Solution for x^2+1.8x-.1685=0 equation:


Simplifying
x2 + 1.8x + -0.1685 = 0

Reorder the terms:
-0.1685 + 1.8x + x2 = 0

Solving
-0.1685 + 1.8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.1685' to each side of the equation.
-0.1685 + 1.8x + 0.1685 + x2 = 0 + 0.1685

Reorder the terms:
-0.1685 + 0.1685 + 1.8x + x2 = 0 + 0.1685

Combine like terms: -0.1685 + 0.1685 = 0.0000
0.0000 + 1.8x + x2 = 0 + 0.1685
1.8x + x2 = 0 + 0.1685

Combine like terms: 0 + 0.1685 = 0.1685
1.8x + x2 = 0.1685

The x term is 1.8x.  Take half its coefficient (0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
1.8x + 0.81 + x2 = 0.1685 + 0.81

Reorder the terms:
0.81 + 1.8x + x2 = 0.1685 + 0.81

Combine like terms: 0.1685 + 0.81 = 0.9785
0.81 + 1.8x + x2 = 0.9785

Factor a perfect square on the left side:
(x + 0.9)(x + 0.9) = 0.9785

Calculate the square root of the right side: 0.989191589

Break this problem into two subproblems by setting 
(x + 0.9) equal to 0.989191589 and -0.989191589.

Subproblem 1

x + 0.9 = 0.989191589 Simplifying x + 0.9 = 0.989191589 Reorder the terms: 0.9 + x = 0.989191589 Solving 0.9 + x = 0.989191589 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = 0.989191589 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = 0.989191589 + -0.9 x = 0.989191589 + -0.9 Combine like terms: 0.989191589 + -0.9 = 0.089191589 x = 0.089191589 Simplifying x = 0.089191589

Subproblem 2

x + 0.9 = -0.989191589 Simplifying x + 0.9 = -0.989191589 Reorder the terms: 0.9 + x = -0.989191589 Solving 0.9 + x = -0.989191589 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = -0.989191589 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = -0.989191589 + -0.9 x = -0.989191589 + -0.9 Combine like terms: -0.989191589 + -0.9 = -1.889191589 x = -1.889191589 Simplifying x = -1.889191589

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.089191589, -1.889191589}

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