5v^2+9v-4=0

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Solution for 5v^2+9v-4=0 equation:


Simplifying
5v2 + 9v + -4 = 0

Reorder the terms:
-4 + 9v + 5v2 = 0

Solving
-4 + 9v + 5v2 = 0

Solving for variable 'v'.

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

Divide each side by '5'.
-0.8 + 1.8v + v2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + 1.8v + 0.8 + v2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + 1.8v + v2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 1.8v + v2 = 0 + 0.8
1.8v + v2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
1.8v + v2 = 0.8

The v term is 1.8v.  Take half its coefficient (0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
1.8v + 0.81 + v2 = 0.8 + 0.81

Reorder the terms:
0.81 + 1.8v + v2 = 0.8 + 0.81

Combine like terms: 0.8 + 0.81 = 1.61
0.81 + 1.8v + v2 = 1.61

Factor a perfect square on the left side:
(v + 0.9)(v + 0.9) = 1.61

Calculate the square root of the right side: 1.268857754

Break this problem into two subproblems by setting 
(v + 0.9) equal to 1.268857754 and -1.268857754.

Subproblem 1

v + 0.9 = 1.268857754 Simplifying v + 0.9 = 1.268857754 Reorder the terms: 0.9 + v = 1.268857754 Solving 0.9 + v = 1.268857754 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + v = 1.268857754 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + v = 1.268857754 + -0.9 v = 1.268857754 + -0.9 Combine like terms: 1.268857754 + -0.9 = 0.368857754 v = 0.368857754 Simplifying v = 0.368857754

Subproblem 2

v + 0.9 = -1.268857754 Simplifying v + 0.9 = -1.268857754 Reorder the terms: 0.9 + v = -1.268857754 Solving 0.9 + v = -1.268857754 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + v = -1.268857754 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + v = -1.268857754 + -0.9 v = -1.268857754 + -0.9 Combine like terms: -1.268857754 + -0.9 = -2.168857754 v = -2.168857754 Simplifying v = -2.168857754

Solution

The solution to the problem is based on the solutions from the subproblems. v = {0.368857754, -2.168857754}

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