V^2-4V=13

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Solution for V^2-4V=13 equation:


Simplifying
V2 + -4V = 13

Reorder the terms:
-4V + V2 = 13

Solving
-4V + V2 = 13

Solving for variable 'V'.

Reorder the terms:
-13 + -4V + V2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + -4V + V2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -4V + 13 + V2 = 0 + 13

Reorder the terms:
-13 + 13 + -4V + V2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -4V + V2 = 0 + 13
-4V + V2 = 0 + 13

Combine like terms: 0 + 13 = 13
-4V + V2 = 13

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 = 13 + 4

Reorder the terms:
4 + -4V + V2 = 13 + 4

Combine like terms: 13 + 4 = 17
4 + -4V + V2 = 17

Factor a perfect square on the left side:
(V + -2)(V + -2) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(V + -2) equal to 4.123105626 and -4.123105626.

Subproblem 1

V + -2 = 4.123105626 Simplifying V + -2 = 4.123105626 Reorder the terms: -2 + V = 4.123105626 Solving -2 + V = 4.123105626 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 = 4.123105626 + 2 Combine like terms: -2 + 2 = 0 0 + V = 4.123105626 + 2 V = 4.123105626 + 2 Combine like terms: 4.123105626 + 2 = 6.123105626 V = 6.123105626 Simplifying V = 6.123105626

Subproblem 2

V + -2 = -4.123105626 Simplifying V + -2 = -4.123105626 Reorder the terms: -2 + V = -4.123105626 Solving -2 + V = -4.123105626 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 = -4.123105626 + 2 Combine like terms: -2 + 2 = 0 0 + V = -4.123105626 + 2 V = -4.123105626 + 2 Combine like terms: -4.123105626 + 2 = -2.123105626 V = -2.123105626 Simplifying V = -2.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. V = {6.123105626, -2.123105626}

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