x^2+16.66x-.66=0

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Solution for x^2+16.66x-.66=0 equation:


Simplifying
x2 + 16.66x + -0.66 = 0

Reorder the terms:
-0.66 + 16.66x + x2 = 0

Solving
-0.66 + 16.66x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.66' to each side of the equation.
-0.66 + 16.66x + 0.66 + x2 = 0 + 0.66

Reorder the terms:
-0.66 + 0.66 + 16.66x + x2 = 0 + 0.66

Combine like terms: -0.66 + 0.66 = 0.00
0.00 + 16.66x + x2 = 0 + 0.66
16.66x + x2 = 0 + 0.66

Combine like terms: 0 + 0.66 = 0.66
16.66x + x2 = 0.66

The x term is 16.66x.  Take half its coefficient (8.33).
Square it (69.3889) and add it to both sides.

Add '69.3889' to each side of the equation.
16.66x + 69.3889 + x2 = 0.66 + 69.3889

Reorder the terms:
69.3889 + 16.66x + x2 = 0.66 + 69.3889

Combine like terms: 0.66 + 69.3889 = 70.0489
69.3889 + 16.66x + x2 = 70.0489

Factor a perfect square on the left side:
(x + 8.33)(x + 8.33) = 70.0489

Calculate the square root of the right side: 8.369522089

Break this problem into two subproblems by setting 
(x + 8.33) equal to 8.369522089 and -8.369522089.

Subproblem 1

x + 8.33 = 8.369522089 Simplifying x + 8.33 = 8.369522089 Reorder the terms: 8.33 + x = 8.369522089 Solving 8.33 + x = 8.369522089 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.33' to each side of the equation. 8.33 + -8.33 + x = 8.369522089 + -8.33 Combine like terms: 8.33 + -8.33 = 0.00 0.00 + x = 8.369522089 + -8.33 x = 8.369522089 + -8.33 Combine like terms: 8.369522089 + -8.33 = 0.039522089 x = 0.039522089 Simplifying x = 0.039522089

Subproblem 2

x + 8.33 = -8.369522089 Simplifying x + 8.33 = -8.369522089 Reorder the terms: 8.33 + x = -8.369522089 Solving 8.33 + x = -8.369522089 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.33' to each side of the equation. 8.33 + -8.33 + x = -8.369522089 + -8.33 Combine like terms: 8.33 + -8.33 = 0.00 0.00 + x = -8.369522089 + -8.33 x = -8.369522089 + -8.33 Combine like terms: -8.369522089 + -8.33 = -16.699522089 x = -16.699522089 Simplifying x = -16.699522089

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.039522089, -16.699522089}

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