5v^2-18v+8=0

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Solution for 5v^2-18v+8=0 equation:


Simplifying
5v2 + -18v + 8 = 0

Reorder the terms:
8 + -18v + 5v2 = 0

Solving
8 + -18v + 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'.
1.6 + -3.6v + v2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + -3.6v + -1.6 + v2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + -3.6v + v2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + -3.6v + v2 = 0 + -1.6
-3.6v + v2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
-3.6v + v2 = -1.6

The v term is -3.6v.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6v + 3.24 + v2 = -1.6 + 3.24

Reorder the terms:
3.24 + -3.6v + v2 = -1.6 + 3.24

Combine like terms: -1.6 + 3.24 = 1.64
3.24 + -3.6v + v2 = 1.64

Factor a perfect square on the left side:
(v + -1.8)(v + -1.8) = 1.64

Calculate the square root of the right side: 1.280624847

Break this problem into two subproblems by setting 
(v + -1.8) equal to 1.280624847 and -1.280624847.

Subproblem 1

v + -1.8 = 1.280624847 Simplifying v + -1.8 = 1.280624847 Reorder the terms: -1.8 + v = 1.280624847 Solving -1.8 + v = 1.280624847 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + v = 1.280624847 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + v = 1.280624847 + 1.8 v = 1.280624847 + 1.8 Combine like terms: 1.280624847 + 1.8 = 3.080624847 v = 3.080624847 Simplifying v = 3.080624847

Subproblem 2

v + -1.8 = -1.280624847 Simplifying v + -1.8 = -1.280624847 Reorder the terms: -1.8 + v = -1.280624847 Solving -1.8 + v = -1.280624847 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + v = -1.280624847 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + v = -1.280624847 + 1.8 v = -1.280624847 + 1.8 Combine like terms: -1.280624847 + 1.8 = 0.519375153 v = 0.519375153 Simplifying v = 0.519375153

Solution

The solution to the problem is based on the solutions from the subproblems. v = {3.080624847, 0.519375153}

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