x^2+8x=-14

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Solution for x^2+8x=-14 equation:


Simplifying
x2 + 8x = -14

Reorder the terms:
8x + x2 = -14

Solving
8x + x2 = -14

Solving for variable 'x'.

Reorder the terms:
14 + 8x + x2 = -14 + 14

Combine like terms: -14 + 14 = 0
14 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + 8x + -14 + x2 = 0 + -14

Reorder the terms:
14 + -14 + 8x + x2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + 8x + x2 = 0 + -14
8x + x2 = 0 + -14

Combine like terms: 0 + -14 = -14
8x + x2 = -14

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = -14 + 16

Reorder the terms:
16 + 8x + x2 = -14 + 16

Combine like terms: -14 + 16 = 2
16 + 8x + x2 = 2

Factor a perfect square on the left side:
(x + 4)(x + 4) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(x + 4) equal to 1.414213562 and -1.414213562.

Subproblem 1

x + 4 = 1.414213562 Simplifying x + 4 = 1.414213562 Reorder the terms: 4 + x = 1.414213562 Solving 4 + x = 1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 1.414213562 + -4 Combine like terms: 4 + -4 = 0 0 + x = 1.414213562 + -4 x = 1.414213562 + -4 Combine like terms: 1.414213562 + -4 = -2.585786438 x = -2.585786438 Simplifying x = -2.585786438

Subproblem 2

x + 4 = -1.414213562 Simplifying x + 4 = -1.414213562 Reorder the terms: 4 + x = -1.414213562 Solving 4 + x = -1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -1.414213562 + -4 Combine like terms: 4 + -4 = 0 0 + x = -1.414213562 + -4 x = -1.414213562 + -4 Combine like terms: -1.414213562 + -4 = -5.414213562 x = -5.414213562 Simplifying x = -5.414213562

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.585786438, -5.414213562}

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