v^2-4v-2=2

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


Simplifying
v2 + -4v + -2 = 2

Reorder the terms:
-2 + -4v + v2 = 2

Solving
-2 + -4v + v2 = 2

Solving for variable 'v'.

Reorder the terms:
-2 + -2 + -4v + v2 = 2 + -2

Combine like terms: -2 + -2 = -4
-4 + -4v + v2 = 2 + -2

Combine like terms: 2 + -2 = 0
-4 + -4v + v2 = 0

Begin completing the square.

Move the constant term to the right:

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

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

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

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

The v term is -4v.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

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

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

Combine like terms: 4 + 4 = 8
4 + -4v + v2 = 8

Factor a perfect square on the left side:
(v + -2)(v + -2) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(v + -2) equal to 2.828427125 and -2.828427125.

Subproblem 1

v + -2 = 2.828427125 Simplifying v + -2 = 2.828427125 Reorder the terms: -2 + v = 2.828427125 Solving -2 + v = 2.828427125 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + v = 2.828427125 + 2 Combine like terms: -2 + 2 = 0 0 + v = 2.828427125 + 2 v = 2.828427125 + 2 Combine like terms: 2.828427125 + 2 = 4.828427125 v = 4.828427125 Simplifying v = 4.828427125

Subproblem 2

v + -2 = -2.828427125 Simplifying v + -2 = -2.828427125 Reorder the terms: -2 + v = -2.828427125 Solving -2 + v = -2.828427125 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + v = -2.828427125 + 2 Combine like terms: -2 + 2 = 0 0 + v = -2.828427125 + 2 v = -2.828427125 + 2 Combine like terms: -2.828427125 + 2 = -0.828427125 v = -0.828427125 Simplifying v = -0.828427125

Solution

The solution to the problem is based on the solutions from the subproblems. v = {4.828427125, -0.828427125}

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