v^2+9=2v^2+4v-6

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Solution for v^2+9=2v^2+4v-6 equation:


Simplifying
v2 + 9 = 2v2 + 4v + -6

Reorder the terms:
9 + v2 = 2v2 + 4v + -6

Reorder the terms:
9 + v2 = -6 + 4v + 2v2

Solving
9 + v2 = -6 + 4v + 2v2

Solving for variable 'v'.

Reorder the terms:
9 + 6 + -4v + v2 + -2v2 = -6 + 4v + 2v2 + 6 + -4v + -2v2

Combine like terms: 9 + 6 = 15
15 + -4v + v2 + -2v2 = -6 + 4v + 2v2 + 6 + -4v + -2v2

Combine like terms: v2 + -2v2 = -1v2
15 + -4v + -1v2 = -6 + 4v + 2v2 + 6 + -4v + -2v2

Reorder the terms:
15 + -4v + -1v2 = -6 + 6 + 4v + -4v + 2v2 + -2v2

Combine like terms: -6 + 6 = 0
15 + -4v + -1v2 = 0 + 4v + -4v + 2v2 + -2v2
15 + -4v + -1v2 = 4v + -4v + 2v2 + -2v2

Combine like terms: 4v + -4v = 0
15 + -4v + -1v2 = 0 + 2v2 + -2v2
15 + -4v + -1v2 = 2v2 + -2v2

Combine like terms: 2v2 + -2v2 = 0
15 + -4v + -1v2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-15 + 4v + v2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 4v + 15 + v2 = 0 + 15

Reorder the terms:
-15 + 15 + 4v + v2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 4v + v2 = 0 + 15
4v + v2 = 0 + 15

Combine like terms: 0 + 15 = 15
4v + v2 = 15

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 = 15 + 4

Reorder the terms:
4 + 4v + v2 = 15 + 4

Combine like terms: 15 + 4 = 19
4 + 4v + v2 = 19

Factor a perfect square on the left side:
(v + 2)(v + 2) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(v + 2) equal to 4.358898944 and -4.358898944.

Subproblem 1

v + 2 = 4.358898944 Simplifying v + 2 = 4.358898944 Reorder the terms: 2 + v = 4.358898944 Solving 2 + v = 4.358898944 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 = 4.358898944 + -2 Combine like terms: 2 + -2 = 0 0 + v = 4.358898944 + -2 v = 4.358898944 + -2 Combine like terms: 4.358898944 + -2 = 2.358898944 v = 2.358898944 Simplifying v = 2.358898944

Subproblem 2

v + 2 = -4.358898944 Simplifying v + 2 = -4.358898944 Reorder the terms: 2 + v = -4.358898944 Solving 2 + v = -4.358898944 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 = -4.358898944 + -2 Combine like terms: 2 + -2 = 0 0 + v = -4.358898944 + -2 v = -4.358898944 + -2 Combine like terms: -4.358898944 + -2 = -6.358898944 v = -6.358898944 Simplifying v = -6.358898944

Solution

The solution to the problem is based on the solutions from the subproblems. v = {2.358898944, -6.358898944}

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