9v^2-v-20=0

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Solution for 9v^2-v-20=0 equation:


Simplifying
9v2 + -1v + -20 = 0

Reorder the terms:
-20 + -1v + 9v2 = 0

Solving
-20 + -1v + 9v2 = 0

Solving for variable 'v'.

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

Divide each side by '9'.
-2.222222222 + -0.1111111111v + v2 = 0

Move the constant term to the right:

Add '2.222222222' to each side of the equation.
-2.222222222 + -0.1111111111v + 2.222222222 + v2 = 0 + 2.222222222

Reorder the terms:
-2.222222222 + 2.222222222 + -0.1111111111v + v2 = 0 + 2.222222222

Combine like terms: -2.222222222 + 2.222222222 = 0.000000000
0.000000000 + -0.1111111111v + v2 = 0 + 2.222222222
-0.1111111111v + v2 = 0 + 2.222222222

Combine like terms: 0 + 2.222222222 = 2.222222222
-0.1111111111v + v2 = 2.222222222

The v term is -0.1111111111v.  Take half its coefficient (-0.05555555555).
Square it (0.003086419752) and add it to both sides.

Add '0.003086419752' to each side of the equation.
-0.1111111111v + 0.003086419752 + v2 = 2.222222222 + 0.003086419752

Reorder the terms:
0.003086419752 + -0.1111111111v + v2 = 2.222222222 + 0.003086419752

Combine like terms: 2.222222222 + 0.003086419752 = 2.225308641752
0.003086419752 + -0.1111111111v + v2 = 2.225308641752

Factor a perfect square on the left side:
(v + -0.05555555555)(v + -0.05555555555) = 2.225308641752

Calculate the square root of the right side: 1.491746842

Break this problem into two subproblems by setting 
(v + -0.05555555555) equal to 1.491746842 and -1.491746842.

Subproblem 1

v + -0.05555555555 = 1.491746842 Simplifying v + -0.05555555555 = 1.491746842 Reorder the terms: -0.05555555555 + v = 1.491746842 Solving -0.05555555555 + v = 1.491746842 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.05555555555' to each side of the equation. -0.05555555555 + 0.05555555555 + v = 1.491746842 + 0.05555555555 Combine like terms: -0.05555555555 + 0.05555555555 = 0.00000000000 0.00000000000 + v = 1.491746842 + 0.05555555555 v = 1.491746842 + 0.05555555555 Combine like terms: 1.491746842 + 0.05555555555 = 1.54730239755 v = 1.54730239755 Simplifying v = 1.54730239755

Subproblem 2

v + -0.05555555555 = -1.491746842 Simplifying v + -0.05555555555 = -1.491746842 Reorder the terms: -0.05555555555 + v = -1.491746842 Solving -0.05555555555 + v = -1.491746842 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.05555555555' to each side of the equation. -0.05555555555 + 0.05555555555 + v = -1.491746842 + 0.05555555555 Combine like terms: -0.05555555555 + 0.05555555555 = 0.00000000000 0.00000000000 + v = -1.491746842 + 0.05555555555 v = -1.491746842 + 0.05555555555 Combine like terms: -1.491746842 + 0.05555555555 = -1.43619128645 v = -1.43619128645 Simplifying v = -1.43619128645

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.54730239755, -1.43619128645}

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