15=0.002(2v^2+120v+3000)

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Solution for 15=0.002(2v^2+120v+3000) equation:


Simplifying
15 = 0.002(2v2 + 120v + 3000)

Reorder the terms:
15 = 0.002(3000 + 120v + 2v2)
15 = (3000 * 0.002 + 120v * 0.002 + 2v2 * 0.002)
15 = (6 + 0.24v + 0.004v2)

Solving
15 = 6 + 0.24v + 0.004v2

Solving for variable 'v'.

Combine like terms: 15 + -6 = 9
9 + -0.24v + -0.004v2 = 6 + 0.24v + 0.004v2 + -6 + -0.24v + -0.004v2

Reorder the terms:
9 + -0.24v + -0.004v2 = 6 + -6 + 0.24v + -0.24v + 0.004v2 + -0.004v2

Combine like terms: 6 + -6 = 0
9 + -0.24v + -0.004v2 = 0 + 0.24v + -0.24v + 0.004v2 + -0.004v2
9 + -0.24v + -0.004v2 = 0.24v + -0.24v + 0.004v2 + -0.004v2

Combine like terms: 0.24v + -0.24v = 0.00
9 + -0.24v + -0.004v2 = 0.00 + 0.004v2 + -0.004v2
9 + -0.24v + -0.004v2 = 0.004v2 + -0.004v2

Combine like terms: 0.004v2 + -0.004v2 = 0.000
9 + -0.24v + -0.004v2 = 0.000

Begin completing the square.  Divide all terms by
-0.004 the coefficient of the squared term: 

Divide each side by '-0.004'.
-2250 + 60v + v2 = 0

Move the constant term to the right:

Add '2250' to each side of the equation.
-2250 + 60v + 2250 + v2 = 0 + 2250

Reorder the terms:
-2250 + 2250 + 60v + v2 = 0 + 2250

Combine like terms: -2250 + 2250 = 0
0 + 60v + v2 = 0 + 2250
60v + v2 = 0 + 2250

Combine like terms: 0 + 2250 = 2250
60v + v2 = 2250

The v term is 60v.  Take half its coefficient (30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
60v + 900 + v2 = 2250 + 900

Reorder the terms:
900 + 60v + v2 = 2250 + 900

Combine like terms: 2250 + 900 = 3150
900 + 60v + v2 = 3150

Factor a perfect square on the left side:
(v + 30)(v + 30) = 3150

Calculate the square root of the right side: 56.124860802

Break this problem into two subproblems by setting 
(v + 30) equal to 56.124860802 and -56.124860802.

Subproblem 1

v + 30 = 56.124860802 Simplifying v + 30 = 56.124860802 Reorder the terms: 30 + v = 56.124860802 Solving 30 + v = 56.124860802 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + v = 56.124860802 + -30 Combine like terms: 30 + -30 = 0 0 + v = 56.124860802 + -30 v = 56.124860802 + -30 Combine like terms: 56.124860802 + -30 = 26.124860802 v = 26.124860802 Simplifying v = 26.124860802

Subproblem 2

v + 30 = -56.124860802 Simplifying v + 30 = -56.124860802 Reorder the terms: 30 + v = -56.124860802 Solving 30 + v = -56.124860802 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + v = -56.124860802 + -30 Combine like terms: 30 + -30 = 0 0 + v = -56.124860802 + -30 v = -56.124860802 + -30 Combine like terms: -56.124860802 + -30 = -86.124860802 v = -86.124860802 Simplifying v = -86.124860802

Solution

The solution to the problem is based on the solutions from the subproblems. v = {26.124860802, -86.124860802}

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