=8v^2+4v-7+v^2-v

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Solution for =8v^2+4v-7+v^2-v equation:


Simplifying
0 = 8v2 + 4v + -7 + v2 + -1v

Reorder the terms:
0 = -7 + 4v + -1v + 8v2 + v2

Combine like terms: 4v + -1v = 3v
0 = -7 + 3v + 8v2 + v2

Combine like terms: 8v2 + v2 = 9v2
0 = -7 + 3v + 9v2

Solving
0 = -7 + 3v + 9v2

Solving for variable 'v'.

Combine like terms: 0 + 7 = 7
7 + -3v + -9v2 = -7 + 3v + 9v2 + 7 + -3v + -9v2

Reorder the terms:
7 + -3v + -9v2 = -7 + 7 + 3v + -3v + 9v2 + -9v2

Combine like terms: -7 + 7 = 0
7 + -3v + -9v2 = 0 + 3v + -3v + 9v2 + -9v2
7 + -3v + -9v2 = 3v + -3v + 9v2 + -9v2

Combine like terms: 3v + -3v = 0
7 + -3v + -9v2 = 0 + 9v2 + -9v2
7 + -3v + -9v2 = 9v2 + -9v2

Combine like terms: 9v2 + -9v2 = 0
7 + -3v + -9v2 = 0

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

Divide each side by '-9'.
-0.7777777778 + 0.3333333333v + v2 = 0

Move the constant term to the right:

Add '0.7777777778' to each side of the equation.
-0.7777777778 + 0.3333333333v + 0.7777777778 + v2 = 0 + 0.7777777778

Reorder the terms:
-0.7777777778 + 0.7777777778 + 0.3333333333v + v2 = 0 + 0.7777777778

Combine like terms: -0.7777777778 + 0.7777777778 = 0.0000000000
0.0000000000 + 0.3333333333v + v2 = 0 + 0.7777777778
0.3333333333v + v2 = 0 + 0.7777777778

Combine like terms: 0 + 0.7777777778 = 0.7777777778
0.3333333333v + v2 = 0.7777777778

The v term is 0.3333333333v.  Take half its coefficient (0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
0.3333333333v + 0.02777777779 + v2 = 0.7777777778 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333v + v2 = 0.7777777778 + 0.02777777779

Combine like terms: 0.7777777778 + 0.02777777779 = 0.80555555559
0.02777777779 + 0.3333333333v + v2 = 0.80555555559

Factor a perfect square on the left side:
(v + 0.1666666667)(v + 0.1666666667) = 0.80555555559

Calculate the square root of the right side: 0.897527468

Break this problem into two subproblems by setting 
(v + 0.1666666667) equal to 0.897527468 and -0.897527468.

Subproblem 1

v + 0.1666666667 = 0.897527468 Simplifying v + 0.1666666667 = 0.897527468 Reorder the terms: 0.1666666667 + v = 0.897527468 Solving 0.1666666667 + v = 0.897527468 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + v = 0.897527468 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + v = 0.897527468 + -0.1666666667 v = 0.897527468 + -0.1666666667 Combine like terms: 0.897527468 + -0.1666666667 = 0.7308608013 v = 0.7308608013 Simplifying v = 0.7308608013

Subproblem 2

v + 0.1666666667 = -0.897527468 Simplifying v + 0.1666666667 = -0.897527468 Reorder the terms: 0.1666666667 + v = -0.897527468 Solving 0.1666666667 + v = -0.897527468 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + v = -0.897527468 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + v = -0.897527468 + -0.1666666667 v = -0.897527468 + -0.1666666667 Combine like terms: -0.897527468 + -0.1666666667 = -1.0641941347 v = -1.0641941347 Simplifying v = -1.0641941347

Solution

The solution to the problem is based on the solutions from the subproblems. v = {0.7308608013, -1.0641941347}

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