v^2+20v=-25

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Solution for v^2+20v=-25 equation:


Simplifying
v2 + 20v = -25

Reorder the terms:
20v + v2 = -25

Solving
20v + v2 = -25

Solving for variable 'v'.

Reorder the terms:
25 + 20v + v2 = -25 + 25

Combine like terms: -25 + 25 = 0
25 + 20v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + 20v + -25 + v2 = 0 + -25

Reorder the terms:
25 + -25 + 20v + v2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + 20v + v2 = 0 + -25
20v + v2 = 0 + -25

Combine like terms: 0 + -25 = -25
20v + v2 = -25

The v term is 20v.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20v + 100 + v2 = -25 + 100

Reorder the terms:
100 + 20v + v2 = -25 + 100

Combine like terms: -25 + 100 = 75
100 + 20v + v2 = 75

Factor a perfect square on the left side:
(v + 10)(v + 10) = 75

Calculate the square root of the right side: 8.660254038

Break this problem into two subproblems by setting 
(v + 10) equal to 8.660254038 and -8.660254038.

Subproblem 1

v + 10 = 8.660254038 Simplifying v + 10 = 8.660254038 Reorder the terms: 10 + v = 8.660254038 Solving 10 + v = 8.660254038 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + v = 8.660254038 + -10 Combine like terms: 10 + -10 = 0 0 + v = 8.660254038 + -10 v = 8.660254038 + -10 Combine like terms: 8.660254038 + -10 = -1.339745962 v = -1.339745962 Simplifying v = -1.339745962

Subproblem 2

v + 10 = -8.660254038 Simplifying v + 10 = -8.660254038 Reorder the terms: 10 + v = -8.660254038 Solving 10 + v = -8.660254038 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + v = -8.660254038 + -10 Combine like terms: 10 + -10 = 0 0 + v = -8.660254038 + -10 v = -8.660254038 + -10 Combine like terms: -8.660254038 + -10 = -18.660254038 v = -18.660254038 Simplifying v = -18.660254038

Solution

The solution to the problem is based on the solutions from the subproblems. v = {-1.339745962, -18.660254038}

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