5v^2+8v-16=0

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Solution for 5v^2+8v-16=0 equation:


Simplifying
5v2 + 8v + -16 = 0

Reorder the terms:
-16 + 8v + 5v2 = 0

Solving
-16 + 8v + 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'.
-3.2 + 1.6v + v2 = 0

Move the constant term to the right:

Add '3.2' to each side of the equation.
-3.2 + 1.6v + 3.2 + v2 = 0 + 3.2

Reorder the terms:
-3.2 + 3.2 + 1.6v + v2 = 0 + 3.2

Combine like terms: -3.2 + 3.2 = 0.0
0.0 + 1.6v + v2 = 0 + 3.2
1.6v + v2 = 0 + 3.2

Combine like terms: 0 + 3.2 = 3.2
1.6v + v2 = 3.2

The v term is 1.6v.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6v + 0.64 + v2 = 3.2 + 0.64

Reorder the terms:
0.64 + 1.6v + v2 = 3.2 + 0.64

Combine like terms: 3.2 + 0.64 = 3.84
0.64 + 1.6v + v2 = 3.84

Factor a perfect square on the left side:
(v + 0.8)(v + 0.8) = 3.84

Calculate the square root of the right side: 1.959591794

Break this problem into two subproblems by setting 
(v + 0.8) equal to 1.959591794 and -1.959591794.

Subproblem 1

v + 0.8 = 1.959591794 Simplifying v + 0.8 = 1.959591794 Reorder the terms: 0.8 + v = 1.959591794 Solving 0.8 + v = 1.959591794 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + v = 1.959591794 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + v = 1.959591794 + -0.8 v = 1.959591794 + -0.8 Combine like terms: 1.959591794 + -0.8 = 1.159591794 v = 1.159591794 Simplifying v = 1.159591794

Subproblem 2

v + 0.8 = -1.959591794 Simplifying v + 0.8 = -1.959591794 Reorder the terms: 0.8 + v = -1.959591794 Solving 0.8 + v = -1.959591794 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + v = -1.959591794 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + v = -1.959591794 + -0.8 v = -1.959591794 + -0.8 Combine like terms: -1.959591794 + -0.8 = -2.759591794 v = -2.759591794 Simplifying v = -2.759591794

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.159591794, -2.759591794}

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