(3v^2-6v-4)+(5v^2-v+2)=0

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Solution for (3v^2-6v-4)+(5v^2-v+2)=0 equation:


Simplifying
(3v2 + -6v + -4) + (5v2 + -1v + 2) = 0

Reorder the terms:
(-4 + -6v + 3v2) + (5v2 + -1v + 2) = 0

Remove parenthesis around (-4 + -6v + 3v2)
-4 + -6v + 3v2 + (5v2 + -1v + 2) = 0

Reorder the terms:
-4 + -6v + 3v2 + (2 + -1v + 5v2) = 0

Remove parenthesis around (2 + -1v + 5v2)
-4 + -6v + 3v2 + 2 + -1v + 5v2 = 0

Reorder the terms:
-4 + 2 + -6v + -1v + 3v2 + 5v2 = 0

Combine like terms: -4 + 2 = -2
-2 + -6v + -1v + 3v2 + 5v2 = 0

Combine like terms: -6v + -1v = -7v
-2 + -7v + 3v2 + 5v2 = 0

Combine like terms: 3v2 + 5v2 = 8v2
-2 + -7v + 8v2 = 0

Solving
-2 + -7v + 8v2 = 0

Solving for variable 'v'.

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

Divide each side by '8'.
-0.25 + -0.875v + v2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -0.875v + 0.25 + v2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -0.875v + v2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -0.875v + v2 = 0 + 0.25
-0.875v + v2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-0.875v + v2 = 0.25

The v term is -0.875v.  Take half its coefficient (-0.4375).
Square it (0.19140625) and add it to both sides.

Add '0.19140625' to each side of the equation.
-0.875v + 0.19140625 + v2 = 0.25 + 0.19140625

Reorder the terms:
0.19140625 + -0.875v + v2 = 0.25 + 0.19140625

Combine like terms: 0.25 + 0.19140625 = 0.44140625
0.19140625 + -0.875v + v2 = 0.44140625

Factor a perfect square on the left side:
(v + -0.4375)(v + -0.4375) = 0.44140625

Calculate the square root of the right side: 0.664384113

Break this problem into two subproblems by setting 
(v + -0.4375) equal to 0.664384113 and -0.664384113.

Subproblem 1

v + -0.4375 = 0.664384113 Simplifying v + -0.4375 = 0.664384113 Reorder the terms: -0.4375 + v = 0.664384113 Solving -0.4375 + v = 0.664384113 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.4375' to each side of the equation. -0.4375 + 0.4375 + v = 0.664384113 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + v = 0.664384113 + 0.4375 v = 0.664384113 + 0.4375 Combine like terms: 0.664384113 + 0.4375 = 1.101884113 v = 1.101884113 Simplifying v = 1.101884113

Subproblem 2

v + -0.4375 = -0.664384113 Simplifying v + -0.4375 = -0.664384113 Reorder the terms: -0.4375 + v = -0.664384113 Solving -0.4375 + v = -0.664384113 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.4375' to each side of the equation. -0.4375 + 0.4375 + v = -0.664384113 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + v = -0.664384113 + 0.4375 v = -0.664384113 + 0.4375 Combine like terms: -0.664384113 + 0.4375 = -0.226884113 v = -0.226884113 Simplifying v = -0.226884113

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.101884113, -0.226884113}

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