z^2+14z+8=0

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Solution for z^2+14z+8=0 equation:


Simplifying
z2 + 14z + 8 = 0

Reorder the terms:
8 + 14z + z2 = 0

Solving
8 + 14z + z2 = 0

Solving for variable 'z'.

Begin completing the square.

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + 14z + -8 + z2 = 0 + -8

Reorder the terms:
8 + -8 + 14z + z2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 14z + z2 = 0 + -8
14z + z2 = 0 + -8

Combine like terms: 0 + -8 = -8
14z + z2 = -8

The z term is 14z.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14z + 49 + z2 = -8 + 49

Reorder the terms:
49 + 14z + z2 = -8 + 49

Combine like terms: -8 + 49 = 41
49 + 14z + z2 = 41

Factor a perfect square on the left side:
(z + 7)(z + 7) = 41

Calculate the square root of the right side: 6.403124237

Break this problem into two subproblems by setting 
(z + 7) equal to 6.403124237 and -6.403124237.

Subproblem 1

z + 7 = 6.403124237 Simplifying z + 7 = 6.403124237 Reorder the terms: 7 + z = 6.403124237 Solving 7 + z = 6.403124237 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + z = 6.403124237 + -7 Combine like terms: 7 + -7 = 0 0 + z = 6.403124237 + -7 z = 6.403124237 + -7 Combine like terms: 6.403124237 + -7 = -0.596875763 z = -0.596875763 Simplifying z = -0.596875763

Subproblem 2

z + 7 = -6.403124237 Simplifying z + 7 = -6.403124237 Reorder the terms: 7 + z = -6.403124237 Solving 7 + z = -6.403124237 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + z = -6.403124237 + -7 Combine like terms: 7 + -7 = 0 0 + z = -6.403124237 + -7 z = -6.403124237 + -7 Combine like terms: -6.403124237 + -7 = -13.403124237 z = -13.403124237 Simplifying z = -13.403124237

Solution

The solution to the problem is based on the solutions from the subproblems. z = {-0.596875763, -13.403124237}

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