10v^2-19=-8v

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Solution for 10v^2-19=-8v equation:


Simplifying
10v2 + -19 = -8v

Reorder the terms:
-19 + 10v2 = -8v

Solving
-19 + 10v2 = -8v

Solving for variable 'v'.

Reorder the terms:
-19 + 8v + 10v2 = -8v + 8v

Combine like terms: -8v + 8v = 0
-19 + 8v + 10v2 = 0

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

Divide each side by '10'.
-1.9 + 0.8v + v2 = 0

Move the constant term to the right:

Add '1.9' to each side of the equation.
-1.9 + 0.8v + 1.9 + v2 = 0 + 1.9

Reorder the terms:
-1.9 + 1.9 + 0.8v + v2 = 0 + 1.9

Combine like terms: -1.9 + 1.9 = 0.0
0.0 + 0.8v + v2 = 0 + 1.9
0.8v + v2 = 0 + 1.9

Combine like terms: 0 + 1.9 = 1.9
0.8v + v2 = 1.9

The v term is 0.8v.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8v + 0.16 + v2 = 1.9 + 0.16

Reorder the terms:
0.16 + 0.8v + v2 = 1.9 + 0.16

Combine like terms: 1.9 + 0.16 = 2.06
0.16 + 0.8v + v2 = 2.06

Factor a perfect square on the left side:
(v + 0.4)(v + 0.4) = 2.06

Calculate the square root of the right side: 1.435270009

Break this problem into two subproblems by setting 
(v + 0.4) equal to 1.435270009 and -1.435270009.

Subproblem 1

v + 0.4 = 1.435270009 Simplifying v + 0.4 = 1.435270009 Reorder the terms: 0.4 + v = 1.435270009 Solving 0.4 + v = 1.435270009 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + v = 1.435270009 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + v = 1.435270009 + -0.4 v = 1.435270009 + -0.4 Combine like terms: 1.435270009 + -0.4 = 1.035270009 v = 1.035270009 Simplifying v = 1.035270009

Subproblem 2

v + 0.4 = -1.435270009 Simplifying v + 0.4 = -1.435270009 Reorder the terms: 0.4 + v = -1.435270009 Solving 0.4 + v = -1.435270009 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + v = -1.435270009 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + v = -1.435270009 + -0.4 v = -1.435270009 + -0.4 Combine like terms: -1.435270009 + -0.4 = -1.835270009 v = -1.835270009 Simplifying v = -1.835270009

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.035270009, -1.835270009}

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