v^2-5v-3.6=0

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Solution for v^2-5v-3.6=0 equation:


Simplifying
v2 + -5v + -3.6 = 0

Reorder the terms:
-3.6 + -5v + v2 = 0

Solving
-3.6 + -5v + v2 = 0

Solving for variable 'v'.

Begin completing the square.

Move the constant term to the right:

Add '3.6' to each side of the equation.
-3.6 + -5v + 3.6 + v2 = 0 + 3.6

Reorder the terms:
-3.6 + 3.6 + -5v + v2 = 0 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + -5v + v2 = 0 + 3.6
-5v + v2 = 0 + 3.6

Combine like terms: 0 + 3.6 = 3.6
-5v + v2 = 3.6

The v term is -5v.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5v + 6.25 + v2 = 3.6 + 6.25

Reorder the terms:
6.25 + -5v + v2 = 3.6 + 6.25

Combine like terms: 3.6 + 6.25 = 9.85
6.25 + -5v + v2 = 9.85

Factor a perfect square on the left side:
(v + -2.5)(v + -2.5) = 9.85

Calculate the square root of the right side: 3.138470965

Break this problem into two subproblems by setting 
(v + -2.5) equal to 3.138470965 and -3.138470965.

Subproblem 1

v + -2.5 = 3.138470965 Simplifying v + -2.5 = 3.138470965 Reorder the terms: -2.5 + v = 3.138470965 Solving -2.5 + v = 3.138470965 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + v = 3.138470965 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + v = 3.138470965 + 2.5 v = 3.138470965 + 2.5 Combine like terms: 3.138470965 + 2.5 = 5.638470965 v = 5.638470965 Simplifying v = 5.638470965

Subproblem 2

v + -2.5 = -3.138470965 Simplifying v + -2.5 = -3.138470965 Reorder the terms: -2.5 + v = -3.138470965 Solving -2.5 + v = -3.138470965 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + v = -3.138470965 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + v = -3.138470965 + 2.5 v = -3.138470965 + 2.5 Combine like terms: -3.138470965 + 2.5 = -0.638470965 v = -0.638470965 Simplifying v = -0.638470965

Solution

The solution to the problem is based on the solutions from the subproblems. v = {5.638470965, -0.638470965}

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