x^2+0.840x-0.1764=0

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Solution for x^2+0.840x-0.1764=0 equation:


Simplifying
x2 + 0.840x + -0.1764 = 0

Reorder the terms:
-0.1764 + 0.840x + x2 = 0

Solving
-0.1764 + 0.840x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.1764' to each side of the equation.
-0.1764 + 0.840x + 0.1764 + x2 = 0 + 0.1764

Reorder the terms:
-0.1764 + 0.1764 + 0.840x + x2 = 0 + 0.1764

Combine like terms: -0.1764 + 0.1764 = 0.0000
0.0000 + 0.840x + x2 = 0 + 0.1764
0.840x + x2 = 0 + 0.1764

Combine like terms: 0 + 0.1764 = 0.1764
0.840x + x2 = 0.1764

The x term is 0.840x.  Take half its coefficient (0.42).
Square it (0.1764) and add it to both sides.

Add '0.1764' to each side of the equation.
0.840x + 0.1764 + x2 = 0.1764 + 0.1764

Reorder the terms:
0.1764 + 0.840x + x2 = 0.1764 + 0.1764

Combine like terms: 0.1764 + 0.1764 = 0.3528
0.1764 + 0.840x + x2 = 0.3528

Factor a perfect square on the left side:
(x + 0.42)(x + 0.42) = 0.3528

Calculate the square root of the right side: 0.593969696

Break this problem into two subproblems by setting 
(x + 0.42) equal to 0.593969696 and -0.593969696.

Subproblem 1

x + 0.42 = 0.593969696 Simplifying x + 0.42 = 0.593969696 Reorder the terms: 0.42 + x = 0.593969696 Solving 0.42 + x = 0.593969696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.42' to each side of the equation. 0.42 + -0.42 + x = 0.593969696 + -0.42 Combine like terms: 0.42 + -0.42 = 0.00 0.00 + x = 0.593969696 + -0.42 x = 0.593969696 + -0.42 Combine like terms: 0.593969696 + -0.42 = 0.173969696 x = 0.173969696 Simplifying x = 0.173969696

Subproblem 2

x + 0.42 = -0.593969696 Simplifying x + 0.42 = -0.593969696 Reorder the terms: 0.42 + x = -0.593969696 Solving 0.42 + x = -0.593969696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.42' to each side of the equation. 0.42 + -0.42 + x = -0.593969696 + -0.42 Combine like terms: 0.42 + -0.42 = 0.00 0.00 + x = -0.593969696 + -0.42 x = -0.593969696 + -0.42 Combine like terms: -0.593969696 + -0.42 = -1.013969696 x = -1.013969696 Simplifying x = -1.013969696

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.173969696, -1.013969696}

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