9v^2-6v-2=0

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Solution for 9v^2-6v-2=0 equation:


Simplifying
9v2 + -6v + -2 = 0

Reorder the terms:
-2 + -6v + 9v2 = 0

Solving
-2 + -6v + 9v2 = 0

Solving for variable 'v'.

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

Divide each side by '9'.
-0.2222222222 + -0.6666666667v + v2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + -0.6666666667v + 0.2222222222 + v2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + -0.6666666667v + v2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + -0.6666666667v + v2 = 0 + 0.2222222222
-0.6666666667v + v2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
-0.6666666667v + v2 = 0.2222222222

The v term is -0.6666666667v.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667v + 0.1111111112 + v2 = 0.2222222222 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667v + v2 = 0.2222222222 + 0.1111111112

Combine like terms: 0.2222222222 + 0.1111111112 = 0.3333333334
0.1111111112 + -0.6666666667v + v2 = 0.3333333334

Factor a perfect square on the left side:
(v + -0.3333333334)(v + -0.3333333334) = 0.3333333334

Calculate the square root of the right side: 0.577350269

Break this problem into two subproblems by setting 
(v + -0.3333333334) equal to 0.577350269 and -0.577350269.

Subproblem 1

v + -0.3333333334 = 0.577350269 Simplifying v + -0.3333333334 = 0.577350269 Reorder the terms: -0.3333333334 + v = 0.577350269 Solving -0.3333333334 + v = 0.577350269 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + v = 0.577350269 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + v = 0.577350269 + 0.3333333334 v = 0.577350269 + 0.3333333334 Combine like terms: 0.577350269 + 0.3333333334 = 0.9106836024 v = 0.9106836024 Simplifying v = 0.9106836024

Subproblem 2

v + -0.3333333334 = -0.577350269 Simplifying v + -0.3333333334 = -0.577350269 Reorder the terms: -0.3333333334 + v = -0.577350269 Solving -0.3333333334 + v = -0.577350269 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + v = -0.577350269 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + v = -0.577350269 + 0.3333333334 v = -0.577350269 + 0.3333333334 Combine like terms: -0.577350269 + 0.3333333334 = -0.2440169356 v = -0.2440169356 Simplifying v = -0.2440169356

Solution

The solution to the problem is based on the solutions from the subproblems. v = {0.9106836024, -0.2440169356}

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