x^2+x-8.67=0

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Solution for x^2+x-8.67=0 equation:


Simplifying
x2 + x + -8.67 = 0

Reorder the terms:
-8.67 + x + x2 = 0

Solving
-8.67 + x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '8.67' to each side of the equation.
-8.67 + x + 8.67 + x2 = 0 + 8.67

Reorder the terms:
-8.67 + 8.67 + x + x2 = 0 + 8.67

Combine like terms: -8.67 + 8.67 = 0.00
0.00 + x + x2 = 0 + 8.67
x + x2 = 0 + 8.67

Combine like terms: 0 + 8.67 = 8.67
x + x2 = 8.67

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 8.67 + 0.25

Reorder the terms:
0.25 + x + x2 = 8.67 + 0.25

Combine like terms: 8.67 + 0.25 = 8.92
0.25 + x + x2 = 8.92

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 8.92

Calculate the square root of the right side: 2.986636905

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.986636905 and -2.986636905.

Subproblem 1

x + 0.5 = 2.986636905 Simplifying x + 0.5 = 2.986636905 Reorder the terms: 0.5 + x = 2.986636905 Solving 0.5 + x = 2.986636905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.986636905 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.986636905 + -0.5 x = 2.986636905 + -0.5 Combine like terms: 2.986636905 + -0.5 = 2.486636905 x = 2.486636905 Simplifying x = 2.486636905

Subproblem 2

x + 0.5 = -2.986636905 Simplifying x + 0.5 = -2.986636905 Reorder the terms: 0.5 + x = -2.986636905 Solving 0.5 + x = -2.986636905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.986636905 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.986636905 + -0.5 x = -2.986636905 + -0.5 Combine like terms: -2.986636905 + -0.5 = -3.486636905 x = -3.486636905 Simplifying x = -3.486636905

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.486636905, -3.486636905}

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