81-36v-4v^2=

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Solution for 81-36v-4v^2= equation:


Simplifying
81 + -36v + -4v2 = 0

Solving
81 + -36v + -4v2 = 0

Solving for variable 'v'.

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-20.25 + 9v + v2 = 0

Move the constant term to the right:

Add '20.25' to each side of the equation.
-20.25 + 9v + 20.25 + v2 = 0 + 20.25

Reorder the terms:
-20.25 + 20.25 + 9v + v2 = 0 + 20.25

Combine like terms: -20.25 + 20.25 = 0.00
0.00 + 9v + v2 = 0 + 20.25
9v + v2 = 0 + 20.25

Combine like terms: 0 + 20.25 = 20.25
9v + v2 = 20.25

The v term is 9v.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9v + 20.25 + v2 = 20.25 + 20.25

Reorder the terms:
20.25 + 9v + v2 = 20.25 + 20.25

Combine like terms: 20.25 + 20.25 = 40.5
20.25 + 9v + v2 = 40.5

Factor a perfect square on the left side:
(v + 4.5)(v + 4.5) = 40.5

Calculate the square root of the right side: 6.363961031

Break this problem into two subproblems by setting 
(v + 4.5) equal to 6.363961031 and -6.363961031.

Subproblem 1

v + 4.5 = 6.363961031 Simplifying v + 4.5 = 6.363961031 Reorder the terms: 4.5 + v = 6.363961031 Solving 4.5 + v = 6.363961031 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + v = 6.363961031 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + v = 6.363961031 + -4.5 v = 6.363961031 + -4.5 Combine like terms: 6.363961031 + -4.5 = 1.863961031 v = 1.863961031 Simplifying v = 1.863961031

Subproblem 2

v + 4.5 = -6.363961031 Simplifying v + 4.5 = -6.363961031 Reorder the terms: 4.5 + v = -6.363961031 Solving 4.5 + v = -6.363961031 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + v = -6.363961031 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + v = -6.363961031 + -4.5 v = -6.363961031 + -4.5 Combine like terms: -6.363961031 + -4.5 = -10.863961031 v = -10.863961031 Simplifying v = -10.863961031

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.863961031, -10.863961031}

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