5v^2-9v-5=0

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


Simplifying
5v2 + -9v + -5 = 0

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

Solving
-5 + -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'.
-1 + -1.8v + v2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.8v + 1 + v2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.8v + v2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.8v + v2 = 0 + 1
-1.8v + v2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.8v + v2 = 1

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 = 1 + 0.81

Reorder the terms:
0.81 + -1.8v + v2 = 1 + 0.81

Combine like terms: 1 + 0.81 = 1.81
0.81 + -1.8v + v2 = 1.81

Factor a perfect square on the left side:
(v + -0.9)(v + -0.9) = 1.81

Calculate the square root of the right side: 1.345362405

Break this problem into two subproblems by setting 
(v + -0.9) equal to 1.345362405 and -1.345362405.

Subproblem 1

v + -0.9 = 1.345362405 Simplifying v + -0.9 = 1.345362405 Reorder the terms: -0.9 + v = 1.345362405 Solving -0.9 + v = 1.345362405 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 = 1.345362405 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + v = 1.345362405 + 0.9 v = 1.345362405 + 0.9 Combine like terms: 1.345362405 + 0.9 = 2.245362405 v = 2.245362405 Simplifying v = 2.245362405

Subproblem 2

v + -0.9 = -1.345362405 Simplifying v + -0.9 = -1.345362405 Reorder the terms: -0.9 + v = -1.345362405 Solving -0.9 + v = -1.345362405 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 = -1.345362405 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + v = -1.345362405 + 0.9 v = -1.345362405 + 0.9 Combine like terms: -1.345362405 + 0.9 = -0.445362405 v = -0.445362405 Simplifying v = -0.445362405

Solution

The solution to the problem is based on the solutions from the subproblems. v = {2.245362405, -0.445362405}

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