v^2+8v+2=0

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Solution for v^2+8v+2=0 equation:


Simplifying
v2 + 8v + 2 = 0

Reorder the terms:
2 + 8v + v2 = 0

Solving
2 + 8v + v2 = 0

Solving for variable 'v'.

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 8v + -2 + v2 = 0 + -2

Reorder the terms:
2 + -2 + 8v + v2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 8v + v2 = 0 + -2
8v + v2 = 0 + -2

Combine like terms: 0 + -2 = -2
8v + v2 = -2

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

Add '16' to each side of the equation.
8v + 16 + v2 = -2 + 16

Reorder the terms:
16 + 8v + v2 = -2 + 16

Combine like terms: -2 + 16 = 14
16 + 8v + v2 = 14

Factor a perfect square on the left side:
(v + 4)(v + 4) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(v + 4) equal to 3.741657387 and -3.741657387.

Subproblem 1

v + 4 = 3.741657387 Simplifying v + 4 = 3.741657387 Reorder the terms: 4 + v = 3.741657387 Solving 4 + v = 3.741657387 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + v = 3.741657387 + -4 Combine like terms: 4 + -4 = 0 0 + v = 3.741657387 + -4 v = 3.741657387 + -4 Combine like terms: 3.741657387 + -4 = -0.258342613 v = -0.258342613 Simplifying v = -0.258342613

Subproblem 2

v + 4 = -3.741657387 Simplifying v + 4 = -3.741657387 Reorder the terms: 4 + v = -3.741657387 Solving 4 + v = -3.741657387 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + v = -3.741657387 + -4 Combine like terms: 4 + -4 = 0 0 + v = -3.741657387 + -4 v = -3.741657387 + -4 Combine like terms: -3.741657387 + -4 = -7.741657387 v = -7.741657387 Simplifying v = -7.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. v = {-0.258342613, -7.741657387}

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