0=4v^2+9v-8

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Solution for 0=4v^2+9v-8 equation:


Simplifying
0 = 4v2 + 9v + -8

Reorder the terms:
0 = -8 + 9v + 4v2

Solving
0 = -8 + 9v + 4v2

Solving for variable 'v'.

Combine like terms: 0 + 8 = 8
8 + -9v + -4v2 = -8 + 9v + 4v2 + 8 + -9v + -4v2

Reorder the terms:
8 + -9v + -4v2 = -8 + 8 + 9v + -9v + 4v2 + -4v2

Combine like terms: -8 + 8 = 0
8 + -9v + -4v2 = 0 + 9v + -9v + 4v2 + -4v2
8 + -9v + -4v2 = 9v + -9v + 4v2 + -4v2

Combine like terms: 9v + -9v = 0
8 + -9v + -4v2 = 0 + 4v2 + -4v2
8 + -9v + -4v2 = 4v2 + -4v2

Combine like terms: 4v2 + -4v2 = 0
8 + -9v + -4v2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-2 + 2.25v + v2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 2.25v + 2 + v2 = 0 + 2

Reorder the terms:
-2 + 2 + 2.25v + v2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 2.25v + v2 = 0 + 2
2.25v + v2 = 0 + 2

Combine like terms: 0 + 2 = 2
2.25v + v2 = 2

The v term is 2.25v.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25v + 1.265625 + v2 = 2 + 1.265625

Reorder the terms:
1.265625 + 2.25v + v2 = 2 + 1.265625

Combine like terms: 2 + 1.265625 = 3.265625
1.265625 + 2.25v + v2 = 3.265625

Factor a perfect square on the left side:
(v + 1.125)(v + 1.125) = 3.265625

Calculate the square root of the right side: 1.807104037

Break this problem into two subproblems by setting 
(v + 1.125) equal to 1.807104037 and -1.807104037.

Subproblem 1

v + 1.125 = 1.807104037 Simplifying v + 1.125 = 1.807104037 Reorder the terms: 1.125 + v = 1.807104037 Solving 1.125 + v = 1.807104037 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + v = 1.807104037 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + v = 1.807104037 + -1.125 v = 1.807104037 + -1.125 Combine like terms: 1.807104037 + -1.125 = 0.682104037 v = 0.682104037 Simplifying v = 0.682104037

Subproblem 2

v + 1.125 = -1.807104037 Simplifying v + 1.125 = -1.807104037 Reorder the terms: 1.125 + v = -1.807104037 Solving 1.125 + v = -1.807104037 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + v = -1.807104037 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + v = -1.807104037 + -1.125 v = -1.807104037 + -1.125 Combine like terms: -1.807104037 + -1.125 = -2.932104037 v = -2.932104037 Simplifying v = -2.932104037

Solution

The solution to the problem is based on the solutions from the subproblems. v = {0.682104037, -2.932104037}

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