v^2+3v-39=0

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Solution for v^2+3v-39=0 equation:


Simplifying
v2 + 3v + -39 = 0

Reorder the terms:
-39 + 3v + v2 = 0

Solving
-39 + 3v + v2 = 0

Solving for variable 'v'.

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + 3v + 39 + v2 = 0 + 39

Reorder the terms:
-39 + 39 + 3v + v2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + 3v + v2 = 0 + 39
3v + v2 = 0 + 39

Combine like terms: 0 + 39 = 39
3v + v2 = 39

The v term is 3v.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3v + 2.25 + v2 = 39 + 2.25

Reorder the terms:
2.25 + 3v + v2 = 39 + 2.25

Combine like terms: 39 + 2.25 = 41.25
2.25 + 3v + v2 = 41.25

Factor a perfect square on the left side:
(v + 1.5)(v + 1.5) = 41.25

Calculate the square root of the right side: 6.422616289

Break this problem into two subproblems by setting 
(v + 1.5) equal to 6.422616289 and -6.422616289.

Subproblem 1

v + 1.5 = 6.422616289 Simplifying v + 1.5 = 6.422616289 Reorder the terms: 1.5 + v = 6.422616289 Solving 1.5 + v = 6.422616289 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + v = 6.422616289 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + v = 6.422616289 + -1.5 v = 6.422616289 + -1.5 Combine like terms: 6.422616289 + -1.5 = 4.922616289 v = 4.922616289 Simplifying v = 4.922616289

Subproblem 2

v + 1.5 = -6.422616289 Simplifying v + 1.5 = -6.422616289 Reorder the terms: 1.5 + v = -6.422616289 Solving 1.5 + v = -6.422616289 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + v = -6.422616289 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + v = -6.422616289 + -1.5 v = -6.422616289 + -1.5 Combine like terms: -6.422616289 + -1.5 = -7.922616289 v = -7.922616289 Simplifying v = -7.922616289

Solution

The solution to the problem is based on the solutions from the subproblems. v = {4.922616289, -7.922616289}

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