3v^2+12v=-8

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Solution for 3v^2+12v=-8 equation:


Simplifying
3v2 + 12v = -8

Reorder the terms:
12v + 3v2 = -8

Solving
12v + 3v2 = -8

Solving for variable 'v'.

Reorder the terms:
8 + 12v + 3v2 = -8 + 8

Combine like terms: -8 + 8 = 0
8 + 12v + 3v2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
2.666666667 + 4v + v2 = 0

Move the constant term to the right:

Add '-2.666666667' to each side of the equation.
2.666666667 + 4v + -2.666666667 + v2 = 0 + -2.666666667

Reorder the terms:
2.666666667 + -2.666666667 + 4v + v2 = 0 + -2.666666667

Combine like terms: 2.666666667 + -2.666666667 = 0.000000000
0.000000000 + 4v + v2 = 0 + -2.666666667
4v + v2 = 0 + -2.666666667

Combine like terms: 0 + -2.666666667 = -2.666666667
4v + v2 = -2.666666667

The v term is 4v.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4v + 4 + v2 = -2.666666667 + 4

Reorder the terms:
4 + 4v + v2 = -2.666666667 + 4

Combine like terms: -2.666666667 + 4 = 1.333333333
4 + 4v + v2 = 1.333333333

Factor a perfect square on the left side:
(v + 2)(v + 2) = 1.333333333

Calculate the square root of the right side: 1.154700538

Break this problem into two subproblems by setting 
(v + 2) equal to 1.154700538 and -1.154700538.

Subproblem 1

v + 2 = 1.154700538 Simplifying v + 2 = 1.154700538 Reorder the terms: 2 + v = 1.154700538 Solving 2 + v = 1.154700538 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + v = 1.154700538 + -2 Combine like terms: 2 + -2 = 0 0 + v = 1.154700538 + -2 v = 1.154700538 + -2 Combine like terms: 1.154700538 + -2 = -0.845299462 v = -0.845299462 Simplifying v = -0.845299462

Subproblem 2

v + 2 = -1.154700538 Simplifying v + 2 = -1.154700538 Reorder the terms: 2 + v = -1.154700538 Solving 2 + v = -1.154700538 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + v = -1.154700538 + -2 Combine like terms: 2 + -2 = 0 0 + v = -1.154700538 + -2 v = -1.154700538 + -2 Combine like terms: -1.154700538 + -2 = -3.154700538 v = -3.154700538 Simplifying v = -3.154700538

Solution

The solution to the problem is based on the solutions from the subproblems. v = {-0.845299462, -3.154700538}

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