3V^2-3V=80

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Solution for 3V^2-3V=80 equation:


Simplifying
3V2 + -3V = 80

Reorder the terms:
-3V + 3V2 = 80

Solving
-3V + 3V2 = 80

Solving for variable 'V'.

Reorder the terms:
-80 + -3V + 3V2 = 80 + -80

Combine like terms: 80 + -80 = 0
-80 + -3V + 3V2 = 0

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

Divide each side by '3'.
-26.66666667 + -1V + V2 = 0

Move the constant term to the right:

Add '26.66666667' to each side of the equation.
-26.66666667 + -1V + 26.66666667 + V2 = 0 + 26.66666667

Reorder the terms:
-26.66666667 + 26.66666667 + -1V + V2 = 0 + 26.66666667

Combine like terms: -26.66666667 + 26.66666667 = 0.00000000
0.00000000 + -1V + V2 = 0 + 26.66666667
-1V + V2 = 0 + 26.66666667

Combine like terms: 0 + 26.66666667 = 26.66666667
-1V + V2 = 26.66666667

The V term is -1V.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1V + 0.25 + V2 = 26.66666667 + 0.25

Reorder the terms:
0.25 + -1V + V2 = 26.66666667 + 0.25

Combine like terms: 26.66666667 + 0.25 = 26.91666667
0.25 + -1V + V2 = 26.91666667

Factor a perfect square on the left side:
(V + -0.5)(V + -0.5) = 26.91666667

Calculate the square root of the right side: 5.188127472

Break this problem into two subproblems by setting 
(V + -0.5) equal to 5.188127472 and -5.188127472.

Subproblem 1

V + -0.5 = 5.188127472 Simplifying V + -0.5 = 5.188127472 Reorder the terms: -0.5 + V = 5.188127472 Solving -0.5 + V = 5.188127472 Solving for variable 'V'. Move all terms containing V to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + V = 5.188127472 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + V = 5.188127472 + 0.5 V = 5.188127472 + 0.5 Combine like terms: 5.188127472 + 0.5 = 5.688127472 V = 5.688127472 Simplifying V = 5.688127472

Subproblem 2

V + -0.5 = -5.188127472 Simplifying V + -0.5 = -5.188127472 Reorder the terms: -0.5 + V = -5.188127472 Solving -0.5 + V = -5.188127472 Solving for variable 'V'. Move all terms containing V to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + V = -5.188127472 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + V = -5.188127472 + 0.5 V = -5.188127472 + 0.5 Combine like terms: -5.188127472 + 0.5 = -4.688127472 V = -4.688127472 Simplifying V = -4.688127472

Solution

The solution to the problem is based on the solutions from the subproblems. V = {5.688127472, -4.688127472}

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