72v^2-42=-35v

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Solution for 72v^2-42=-35v equation:


Simplifying
72v2 + -42 = -35v

Reorder the terms:
-42 + 72v2 = -35v

Solving
-42 + 72v2 = -35v

Solving for variable 'v'.

Reorder the terms:
-42 + 35v + 72v2 = -35v + 35v

Combine like terms: -35v + 35v = 0
-42 + 35v + 72v2 = 0

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

Divide each side by '72'.
-0.5833333333 + 0.4861111111v + v2 = 0

Move the constant term to the right:

Add '0.5833333333' to each side of the equation.
-0.5833333333 + 0.4861111111v + 0.5833333333 + v2 = 0 + 0.5833333333

Reorder the terms:
-0.5833333333 + 0.5833333333 + 0.4861111111v + v2 = 0 + 0.5833333333

Combine like terms: -0.5833333333 + 0.5833333333 = 0.0000000000
0.0000000000 + 0.4861111111v + v2 = 0 + 0.5833333333
0.4861111111v + v2 = 0 + 0.5833333333

Combine like terms: 0 + 0.5833333333 = 0.5833333333
0.4861111111v + v2 = 0.5833333333

The v term is 0.4861111111v.  Take half its coefficient (0.2430555556).
Square it (0.05907600311) and add it to both sides.

Add '0.05907600311' to each side of the equation.
0.4861111111v + 0.05907600311 + v2 = 0.5833333333 + 0.05907600311

Reorder the terms:
0.05907600311 + 0.4861111111v + v2 = 0.5833333333 + 0.05907600311

Combine like terms: 0.5833333333 + 0.05907600311 = 0.64240933641
0.05907600311 + 0.4861111111v + v2 = 0.64240933641

Factor a perfect square on the left side:
(v + 0.2430555556)(v + 0.2430555556) = 0.64240933641

Calculate the square root of the right side: 0.801504421

Break this problem into two subproblems by setting 
(v + 0.2430555556) equal to 0.801504421 and -0.801504421.

Subproblem 1

v + 0.2430555556 = 0.801504421 Simplifying v + 0.2430555556 = 0.801504421 Reorder the terms: 0.2430555556 + v = 0.801504421 Solving 0.2430555556 + v = 0.801504421 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.2430555556' to each side of the equation. 0.2430555556 + -0.2430555556 + v = 0.801504421 + -0.2430555556 Combine like terms: 0.2430555556 + -0.2430555556 = 0.0000000000 0.0000000000 + v = 0.801504421 + -0.2430555556 v = 0.801504421 + -0.2430555556 Combine like terms: 0.801504421 + -0.2430555556 = 0.5584488654 v = 0.5584488654 Simplifying v = 0.5584488654

Subproblem 2

v + 0.2430555556 = -0.801504421 Simplifying v + 0.2430555556 = -0.801504421 Reorder the terms: 0.2430555556 + v = -0.801504421 Solving 0.2430555556 + v = -0.801504421 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.2430555556' to each side of the equation. 0.2430555556 + -0.2430555556 + v = -0.801504421 + -0.2430555556 Combine like terms: 0.2430555556 + -0.2430555556 = 0.0000000000 0.0000000000 + v = -0.801504421 + -0.2430555556 v = -0.801504421 + -0.2430555556 Combine like terms: -0.801504421 + -0.2430555556 = -1.0445599766 v = -1.0445599766 Simplifying v = -1.0445599766

Solution

The solution to the problem is based on the solutions from the subproblems. v = {0.5584488654, -1.0445599766}

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