0=x^2-5x-6.67

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Solution for 0=x^2-5x-6.67 equation:


Simplifying
0 = x2 + -5x + -6.67

Reorder the terms:
0 = -6.67 + -5x + x2

Solving
0 = -6.67 + -5x + x2

Solving for variable 'x'.

Combine like terms: 0 + 6.67 = 6.67
6.67 + 5x + -1x2 = -6.67 + -5x + x2 + 6.67 + 5x + -1x2

Reorder the terms:
6.67 + 5x + -1x2 = -6.67 + 6.67 + -5x + 5x + x2 + -1x2

Combine like terms: -6.67 + 6.67 = 0.00
6.67 + 5x + -1x2 = 0.00 + -5x + 5x + x2 + -1x2
6.67 + 5x + -1x2 = -5x + 5x + x2 + -1x2

Combine like terms: -5x + 5x = 0
6.67 + 5x + -1x2 = 0 + x2 + -1x2
6.67 + 5x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
6.67 + 5x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-6.67 + -5x + x2 = 0

Move the constant term to the right:

Add '6.67' to each side of the equation.
-6.67 + -5x + 6.67 + x2 = 0 + 6.67

Reorder the terms:
-6.67 + 6.67 + -5x + x2 = 0 + 6.67

Combine like terms: -6.67 + 6.67 = 0.00
0.00 + -5x + x2 = 0 + 6.67
-5x + x2 = 0 + 6.67

Combine like terms: 0 + 6.67 = 6.67
-5x + x2 = 6.67

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 6.67 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 6.67 + 6.25

Combine like terms: 6.67 + 6.25 = 12.92
6.25 + -5x + x2 = 12.92

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 12.92

Calculate the square root of the right side: 3.594440151

Break this problem into two subproblems by setting 
(x + -2.5) equal to 3.594440151 and -3.594440151.

Subproblem 1

x + -2.5 = 3.594440151 Simplifying x + -2.5 = 3.594440151 Reorder the terms: -2.5 + x = 3.594440151 Solving -2.5 + x = 3.594440151 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 3.594440151 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 3.594440151 + 2.5 x = 3.594440151 + 2.5 Combine like terms: 3.594440151 + 2.5 = 6.094440151 x = 6.094440151 Simplifying x = 6.094440151

Subproblem 2

x + -2.5 = -3.594440151 Simplifying x + -2.5 = -3.594440151 Reorder the terms: -2.5 + x = -3.594440151 Solving -2.5 + x = -3.594440151 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -3.594440151 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -3.594440151 + 2.5 x = -3.594440151 + 2.5 Combine like terms: -3.594440151 + 2.5 = -1.094440151 x = -1.094440151 Simplifying x = -1.094440151

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.094440151, -1.094440151}

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