v^2+5v=8

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Solution for v^2+5v=8 equation:


Simplifying
v2 + 5v = 8

Reorder the terms:
5v + v2 = 8

Solving
5v + v2 = 8

Solving for variable 'v'.

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

Combine like terms: 8 + -8 = 0
-8 + 5v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 5v + 8 + v2 = 0 + 8

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

Combine like terms: -8 + 8 = 0
0 + 5v + v2 = 0 + 8
5v + v2 = 0 + 8

Combine like terms: 0 + 8 = 8
5v + v2 = 8

The v term is 5v.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5v + 6.25 + v2 = 8 + 6.25

Reorder the terms:
6.25 + 5v + v2 = 8 + 6.25

Combine like terms: 8 + 6.25 = 14.25
6.25 + 5v + v2 = 14.25

Factor a perfect square on the left side:
(v + 2.5)(v + 2.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(v + 2.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

v + 2.5 = 3.774917218 Simplifying v + 2.5 = 3.774917218 Reorder the terms: 2.5 + v = 3.774917218 Solving 2.5 + v = 3.774917218 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + v = 3.774917218 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + v = 3.774917218 + -2.5 v = 3.774917218 + -2.5 Combine like terms: 3.774917218 + -2.5 = 1.274917218 v = 1.274917218 Simplifying v = 1.274917218

Subproblem 2

v + 2.5 = -3.774917218 Simplifying v + 2.5 = -3.774917218 Reorder the terms: 2.5 + v = -3.774917218 Solving 2.5 + v = -3.774917218 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + v = -3.774917218 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + v = -3.774917218 + -2.5 v = -3.774917218 + -2.5 Combine like terms: -3.774917218 + -2.5 = -6.274917218 v = -6.274917218 Simplifying v = -6.274917218

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.274917218, -6.274917218}

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