2v^2+105v+90=0

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Solution for 2v^2+105v+90=0 equation:


Simplifying
2v2 + 105v + 90 = 0

Reorder the terms:
90 + 105v + 2v2 = 0

Solving
90 + 105v + 2v2 = 0

Solving for variable 'v'.

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

Divide each side by '2'.
45 + 52.5v + v2 = 0

Move the constant term to the right:

Add '-45' to each side of the equation.
45 + 52.5v + -45 + v2 = 0 + -45

Reorder the terms:
45 + -45 + 52.5v + v2 = 0 + -45

Combine like terms: 45 + -45 = 0
0 + 52.5v + v2 = 0 + -45
52.5v + v2 = 0 + -45

Combine like terms: 0 + -45 = -45
52.5v + v2 = -45

The v term is 52.5v.  Take half its coefficient (26.25).
Square it (689.0625) and add it to both sides.

Add '689.0625' to each side of the equation.
52.5v + 689.0625 + v2 = -45 + 689.0625

Reorder the terms:
689.0625 + 52.5v + v2 = -45 + 689.0625

Combine like terms: -45 + 689.0625 = 644.0625
689.0625 + 52.5v + v2 = 644.0625

Factor a perfect square on the left side:
(v + 26.25)(v + 26.25) = 644.0625

Calculate the square root of the right side: 25.378386474

Break this problem into two subproblems by setting 
(v + 26.25) equal to 25.378386474 and -25.378386474.

Subproblem 1

v + 26.25 = 25.378386474 Simplifying v + 26.25 = 25.378386474 Reorder the terms: 26.25 + v = 25.378386474 Solving 26.25 + v = 25.378386474 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-26.25' to each side of the equation. 26.25 + -26.25 + v = 25.378386474 + -26.25 Combine like terms: 26.25 + -26.25 = 0.00 0.00 + v = 25.378386474 + -26.25 v = 25.378386474 + -26.25 Combine like terms: 25.378386474 + -26.25 = -0.871613526 v = -0.871613526 Simplifying v = -0.871613526

Subproblem 2

v + 26.25 = -25.378386474 Simplifying v + 26.25 = -25.378386474 Reorder the terms: 26.25 + v = -25.378386474 Solving 26.25 + v = -25.378386474 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-26.25' to each side of the equation. 26.25 + -26.25 + v = -25.378386474 + -26.25 Combine like terms: 26.25 + -26.25 = 0.00 0.00 + v = -25.378386474 + -26.25 v = -25.378386474 + -26.25 Combine like terms: -25.378386474 + -26.25 = -51.628386474 v = -51.628386474 Simplifying v = -51.628386474

Solution

The solution to the problem is based on the solutions from the subproblems. v = {-0.871613526, -51.628386474}

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