x^2+.66667x-.66667=0

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Solution for x^2+.66667x-.66667=0 equation:


Simplifying
x2 + 0.66667x + -0.66667 = 0

Reorder the terms:
-0.66667 + 0.66667x + x2 = 0

Solving
-0.66667 + 0.66667x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.66667' to each side of the equation.
-0.66667 + 0.66667x + 0.66667 + x2 = 0 + 0.66667

Reorder the terms:
-0.66667 + 0.66667 + 0.66667x + x2 = 0 + 0.66667

Combine like terms: -0.66667 + 0.66667 = 0.00000
0.00000 + 0.66667x + x2 = 0 + 0.66667
0.66667x + x2 = 0 + 0.66667

Combine like terms: 0 + 0.66667 = 0.66667
0.66667x + x2 = 0.66667

The x term is 0.66667x.  Take half its coefficient (0.333335).
Square it (0.1111122222) and add it to both sides.

Add '0.1111122222' to each side of the equation.
0.66667x + 0.1111122222 + x2 = 0.66667 + 0.1111122222

Reorder the terms:
0.1111122222 + 0.66667x + x2 = 0.66667 + 0.1111122222

Combine like terms: 0.66667 + 0.1111122222 = 0.7777822222
0.1111122222 + 0.66667x + x2 = 0.7777822222

Factor a perfect square on the left side:
(x + 0.333335)(x + 0.333335) = 0.7777822222

Calculate the square root of the right side: 0.881919623

Break this problem into two subproblems by setting 
(x + 0.333335) equal to 0.881919623 and -0.881919623.

Subproblem 1

x + 0.333335 = 0.881919623 Simplifying x + 0.333335 = 0.881919623 Reorder the terms: 0.333335 + x = 0.881919623 Solving 0.333335 + x = 0.881919623 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.333335' to each side of the equation. 0.333335 + -0.333335 + x = 0.881919623 + -0.333335 Combine like terms: 0.333335 + -0.333335 = 0.000000 0.000000 + x = 0.881919623 + -0.333335 x = 0.881919623 + -0.333335 Combine like terms: 0.881919623 + -0.333335 = 0.548584623 x = 0.548584623 Simplifying x = 0.548584623

Subproblem 2

x + 0.333335 = -0.881919623 Simplifying x + 0.333335 = -0.881919623 Reorder the terms: 0.333335 + x = -0.881919623 Solving 0.333335 + x = -0.881919623 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.333335' to each side of the equation. 0.333335 + -0.333335 + x = -0.881919623 + -0.333335 Combine like terms: 0.333335 + -0.333335 = 0.000000 0.000000 + x = -0.881919623 + -0.333335 x = -0.881919623 + -0.333335 Combine like terms: -0.881919623 + -0.333335 = -1.215254623 x = -1.215254623 Simplifying x = -1.215254623

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.548584623, -1.215254623}

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