x^2+6x-86=0

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Solution for x^2+6x-86=0 equation:


Simplifying
x2 + 6x + -86 = 0

Reorder the terms:
-86 + 6x + x2 = 0

Solving
-86 + 6x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '86' to each side of the equation.
-86 + 6x + 86 + x2 = 0 + 86

Reorder the terms:
-86 + 86 + 6x + x2 = 0 + 86

Combine like terms: -86 + 86 = 0
0 + 6x + x2 = 0 + 86
6x + x2 = 0 + 86

Combine like terms: 0 + 86 = 86
6x + x2 = 86

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 86 + 9

Reorder the terms:
9 + 6x + x2 = 86 + 9

Combine like terms: 86 + 9 = 95
9 + 6x + x2 = 95

Factor a perfect square on the left side:
(x + 3)(x + 3) = 95

Calculate the square root of the right side: 9.746794345

Break this problem into two subproblems by setting 
(x + 3) equal to 9.746794345 and -9.746794345.

Subproblem 1

x + 3 = 9.746794345 Simplifying x + 3 = 9.746794345 Reorder the terms: 3 + x = 9.746794345 Solving 3 + x = 9.746794345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 9.746794345 + -3 Combine like terms: 3 + -3 = 0 0 + x = 9.746794345 + -3 x = 9.746794345 + -3 Combine like terms: 9.746794345 + -3 = 6.746794345 x = 6.746794345 Simplifying x = 6.746794345

Subproblem 2

x + 3 = -9.746794345 Simplifying x + 3 = -9.746794345 Reorder the terms: 3 + x = -9.746794345 Solving 3 + x = -9.746794345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -9.746794345 + -3 Combine like terms: 3 + -3 = 0 0 + x = -9.746794345 + -3 x = -9.746794345 + -3 Combine like terms: -9.746794345 + -3 = -12.746794345 x = -12.746794345 Simplifying x = -12.746794345

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.746794345, -12.746794345}

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