x^2-2x=0.4

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Solution for x^2-2x=0.4 equation:


Simplifying
x2 + -2x = 0.4

Reorder the terms:
-2x + x2 = 0.4

Solving
-2x + x2 = 0.4

Solving for variable 'x'.

Reorder the terms:
-0.4 + -2x + x2 = 0.4 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
-0.4 + -2x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -2x + 0.4 + x2 = 0.0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -2x + x2 = 0.0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -2x + x2 = 0.0 + 0.4
-2x + x2 = 0.0 + 0.4

Combine like terms: 0.0 + 0.4 = 0.4
-2x + x2 = 0.4

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 0.4 + 1

Reorder the terms:
1 + -2x + x2 = 0.4 + 1

Combine like terms: 0.4 + 1 = 1.4
1 + -2x + x2 = 1.4

Factor a perfect square on the left side:
(x + -1)(x + -1) = 1.4

Calculate the square root of the right side: 1.183215957

Break this problem into two subproblems by setting 
(x + -1) equal to 1.183215957 and -1.183215957.

Subproblem 1

x + -1 = 1.183215957 Simplifying x + -1 = 1.183215957 Reorder the terms: -1 + x = 1.183215957 Solving -1 + x = 1.183215957 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 1.183215957 + 1 Combine like terms: -1 + 1 = 0 0 + x = 1.183215957 + 1 x = 1.183215957 + 1 Combine like terms: 1.183215957 + 1 = 2.183215957 x = 2.183215957 Simplifying x = 2.183215957

Subproblem 2

x + -1 = -1.183215957 Simplifying x + -1 = -1.183215957 Reorder the terms: -1 + x = -1.183215957 Solving -1 + x = -1.183215957 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -1.183215957 + 1 Combine like terms: -1 + 1 = 0 0 + x = -1.183215957 + 1 x = -1.183215957 + 1 Combine like terms: -1.183215957 + 1 = -0.183215957 x = -0.183215957 Simplifying x = -0.183215957

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.183215957, -0.183215957}

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