v^2-4+9v=0

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Solution for v^2-4+9v=0 equation:


Simplifying
v2 + -4 + 9v = 0

Reorder the terms:
-4 + 9v + v2 = 0

Solving
-4 + 9v + v2 = 0

Solving for variable 'v'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 9v + 4 + v2 = 0 + 4

Reorder the terms:
-4 + 4 + 9v + v2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 9v + v2 = 0 + 4
9v + v2 = 0 + 4

Combine like terms: 0 + 4 = 4
9v + v2 = 4

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 = 4 + 20.25

Reorder the terms:
20.25 + 9v + v2 = 4 + 20.25

Combine like terms: 4 + 20.25 = 24.25
20.25 + 9v + v2 = 24.25

Factor a perfect square on the left side:
(v + 4.5)(v + 4.5) = 24.25

Calculate the square root of the right side: 4.924428901

Break this problem into two subproblems by setting 
(v + 4.5) equal to 4.924428901 and -4.924428901.

Subproblem 1

v + 4.5 = 4.924428901 Simplifying v + 4.5 = 4.924428901 Reorder the terms: 4.5 + v = 4.924428901 Solving 4.5 + v = 4.924428901 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 = 4.924428901 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + v = 4.924428901 + -4.5 v = 4.924428901 + -4.5 Combine like terms: 4.924428901 + -4.5 = 0.424428901 v = 0.424428901 Simplifying v = 0.424428901

Subproblem 2

v + 4.5 = -4.924428901 Simplifying v + 4.5 = -4.924428901 Reorder the terms: 4.5 + v = -4.924428901 Solving 4.5 + v = -4.924428901 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 = -4.924428901 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + v = -4.924428901 + -4.5 v = -4.924428901 + -4.5 Combine like terms: -4.924428901 + -4.5 = -9.424428901 v = -9.424428901 Simplifying v = -9.424428901

Solution

The solution to the problem is based on the solutions from the subproblems. v = {0.424428901, -9.424428901}

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