x^2-.666x=7

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Solution for x^2-.666x=7 equation:


Simplifying
x2 + -0.666x = 7

Reorder the terms:
-0.666x + x2 = 7

Solving
-0.666x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + -0.666x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + -0.666x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -0.666x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -0.666x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -0.666x + x2 = 0 + 7
-0.666x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-0.666x + x2 = 7

The x term is -0.666x.  Take half its coefficient (-0.333).
Square it (0.110889) and add it to both sides.

Add '0.110889' to each side of the equation.
-0.666x + 0.110889 + x2 = 7 + 0.110889

Reorder the terms:
0.110889 + -0.666x + x2 = 7 + 0.110889

Combine like terms: 7 + 0.110889 = 7.110889
0.110889 + -0.666x + x2 = 7.110889

Factor a perfect square on the left side:
(x + -0.333)(x + -0.333) = 7.110889

Calculate the square root of the right side: 2.666625021

Break this problem into two subproblems by setting 
(x + -0.333) equal to 2.666625021 and -2.666625021.

Subproblem 1

x + -0.333 = 2.666625021 Simplifying x + -0.333 = 2.666625021 Reorder the terms: -0.333 + x = 2.666625021 Solving -0.333 + x = 2.666625021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.333' to each side of the equation. -0.333 + 0.333 + x = 2.666625021 + 0.333 Combine like terms: -0.333 + 0.333 = 0.000 0.000 + x = 2.666625021 + 0.333 x = 2.666625021 + 0.333 Combine like terms: 2.666625021 + 0.333 = 2.999625021 x = 2.999625021 Simplifying x = 2.999625021

Subproblem 2

x + -0.333 = -2.666625021 Simplifying x + -0.333 = -2.666625021 Reorder the terms: -0.333 + x = -2.666625021 Solving -0.333 + x = -2.666625021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.333' to each side of the equation. -0.333 + 0.333 + x = -2.666625021 + 0.333 Combine like terms: -0.333 + 0.333 = 0.000 0.000 + x = -2.666625021 + 0.333 x = -2.666625021 + 0.333 Combine like terms: -2.666625021 + 0.333 = -2.333625021 x = -2.333625021 Simplifying x = -2.333625021

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.999625021, -2.333625021}

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