6v-v^2=-8

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Solution for 6v-v^2=-8 equation:


Simplifying
6v + -1v2 = -8

Solving
6v + -1v2 = -8

Solving for variable 'v'.

Reorder the terms:
8 + 6v + -1v2 = -8 + 8

Combine like terms: -8 + 8 = 0
8 + 6v + -1v2 = 0

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

Divide each side by '-1'.
-8 + -6v + v2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -6v + 8 + v2 = 0 + 8

Reorder the terms:
-8 + 8 + -6v + v2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -6v + v2 = 0 + 8
-6v + v2 = 0 + 8

Combine like terms: 0 + 8 = 8
-6v + v2 = 8

The v term is -6v.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6v + 9 + v2 = 8 + 9

Reorder the terms:
9 + -6v + v2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + -6v + v2 = 17

Factor a perfect square on the left side:
(v + -3)(v + -3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(v + -3) equal to 4.123105626 and -4.123105626.

Subproblem 1

v + -3 = 4.123105626 Simplifying v + -3 = 4.123105626 Reorder the terms: -3 + v = 4.123105626 Solving -3 + v = 4.123105626 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + v = 4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + v = 4.123105626 + 3 v = 4.123105626 + 3 Combine like terms: 4.123105626 + 3 = 7.123105626 v = 7.123105626 Simplifying v = 7.123105626

Subproblem 2

v + -3 = -4.123105626 Simplifying v + -3 = -4.123105626 Reorder the terms: -3 + v = -4.123105626 Solving -3 + v = -4.123105626 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + v = -4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + v = -4.123105626 + 3 v = -4.123105626 + 3 Combine like terms: -4.123105626 + 3 = -1.123105626 v = -1.123105626 Simplifying v = -1.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. v = {7.123105626, -1.123105626}

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