(x-.667)(x+.778)=0

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Solution for (x-.667)(x+.778)=0 equation:


Simplifying
(x + -0.667)(x + 0.778) = 0

Reorder the terms:
(-0.667 + x)(x + 0.778) = 0

Reorder the terms:
(-0.667 + x)(0.778 + x) = 0

Multiply (-0.667 + x) * (0.778 + x)
(-0.667(0.778 + x) + x(0.778 + x)) = 0
((0.778 * -0.667 + x * -0.667) + x(0.778 + x)) = 0
((-0.518926 + -0.667x) + x(0.778 + x)) = 0
(-0.518926 + -0.667x + (0.778 * x + x * x)) = 0
(-0.518926 + -0.667x + (0.778x + x2)) = 0

Combine like terms: -0.667x + 0.778x = 0.111x
(-0.518926 + 0.111x + x2) = 0

Solving
-0.518926 + 0.111x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.518926' to each side of the equation.
-0.518926 + 0.111x + 0.518926 + x2 = 0 + 0.518926

Reorder the terms:
-0.518926 + 0.518926 + 0.111x + x2 = 0 + 0.518926

Combine like terms: -0.518926 + 0.518926 = 0.000000
0.000000 + 0.111x + x2 = 0 + 0.518926
0.111x + x2 = 0 + 0.518926

Combine like terms: 0 + 0.518926 = 0.518926
0.111x + x2 = 0.518926

The x term is 0.111x.  Take half its coefficient (0.0555).
Square it (0.00308025) and add it to both sides.

Add '0.00308025' to each side of the equation.
0.111x + 0.00308025 + x2 = 0.518926 + 0.00308025

Reorder the terms:
0.00308025 + 0.111x + x2 = 0.518926 + 0.00308025

Combine like terms: 0.518926 + 0.00308025 = 0.52200625
0.00308025 + 0.111x + x2 = 0.52200625

Factor a perfect square on the left side:
(x + 0.0555)(x + 0.0555) = 0.52200625

Calculate the square root of the right side: 0.7225

Break this problem into two subproblems by setting 
(x + 0.0555) equal to 0.7225 and -0.7225.

Subproblem 1

x + 0.0555 = 0.7225 Simplifying x + 0.0555 = 0.7225 Reorder the terms: 0.0555 + x = 0.7225 Solving 0.0555 + x = 0.7225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0555' to each side of the equation. 0.0555 + -0.0555 + x = 0.7225 + -0.0555 Combine like terms: 0.0555 + -0.0555 = 0.0000 0.0000 + x = 0.7225 + -0.0555 x = 0.7225 + -0.0555 Combine like terms: 0.7225 + -0.0555 = 0.667 x = 0.667 Simplifying x = 0.667

Subproblem 2

x + 0.0555 = -0.7225 Simplifying x + 0.0555 = -0.7225 Reorder the terms: 0.0555 + x = -0.7225 Solving 0.0555 + x = -0.7225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0555' to each side of the equation. 0.0555 + -0.0555 + x = -0.7225 + -0.0555 Combine like terms: 0.0555 + -0.0555 = 0.0000 0.0000 + x = -0.7225 + -0.0555 x = -0.7225 + -0.0555 Combine like terms: -0.7225 + -0.0555 = -0.778 x = -0.778 Simplifying x = -0.778

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.667, -0.778}

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