4v^2+8v-39=0

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Solution for 4v^2+8v-39=0 equation:


Simplifying
4v2 + 8v + -39 = 0

Reorder the terms:
-39 + 8v + 4v2 = 0

Solving
-39 + 8v + 4v2 = 0

Solving for variable 'v'.

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

Divide each side by '4'.
-9.75 + 2v + v2 = 0

Move the constant term to the right:

Add '9.75' to each side of the equation.
-9.75 + 2v + 9.75 + v2 = 0 + 9.75

Reorder the terms:
-9.75 + 9.75 + 2v + v2 = 0 + 9.75

Combine like terms: -9.75 + 9.75 = 0.00
0.00 + 2v + v2 = 0 + 9.75
2v + v2 = 0 + 9.75

Combine like terms: 0 + 9.75 = 9.75
2v + v2 = 9.75

The v term is 2v.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2v + 1 + v2 = 9.75 + 1

Reorder the terms:
1 + 2v + v2 = 9.75 + 1

Combine like terms: 9.75 + 1 = 10.75
1 + 2v + v2 = 10.75

Factor a perfect square on the left side:
(v + 1)(v + 1) = 10.75

Calculate the square root of the right side: 3.278719262

Break this problem into two subproblems by setting 
(v + 1) equal to 3.278719262 and -3.278719262.

Subproblem 1

v + 1 = 3.278719262 Simplifying v + 1 = 3.278719262 Reorder the terms: 1 + v = 3.278719262 Solving 1 + v = 3.278719262 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + v = 3.278719262 + -1 Combine like terms: 1 + -1 = 0 0 + v = 3.278719262 + -1 v = 3.278719262 + -1 Combine like terms: 3.278719262 + -1 = 2.278719262 v = 2.278719262 Simplifying v = 2.278719262

Subproblem 2

v + 1 = -3.278719262 Simplifying v + 1 = -3.278719262 Reorder the terms: 1 + v = -3.278719262 Solving 1 + v = -3.278719262 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + v = -3.278719262 + -1 Combine like terms: 1 + -1 = 0 0 + v = -3.278719262 + -1 v = -3.278719262 + -1 Combine like terms: -3.278719262 + -1 = -4.278719262 v = -4.278719262 Simplifying v = -4.278719262

Solution

The solution to the problem is based on the solutions from the subproblems. v = {2.278719262, -4.278719262}

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