0=v^2+0.4v-450000

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Solution for 0=v^2+0.4v-450000 equation:


Simplifying
0 = v2 + 0.4v + -450000

Reorder the terms:
0 = -450000 + 0.4v + v2

Solving
0 = -450000 + 0.4v + v2

Solving for variable 'v'.

Combine like terms: 0 + 450000 = 450000
450000 + -0.4v + -1v2 = -450000 + 0.4v + v2 + 450000 + -0.4v + -1v2

Reorder the terms:
450000 + -0.4v + -1v2 = -450000 + 450000 + 0.4v + -0.4v + v2 + -1v2

Combine like terms: -450000 + 450000 = 0
450000 + -0.4v + -1v2 = 0 + 0.4v + -0.4v + v2 + -1v2
450000 + -0.4v + -1v2 = 0.4v + -0.4v + v2 + -1v2

Combine like terms: 0.4v + -0.4v = 0.0
450000 + -0.4v + -1v2 = 0.0 + v2 + -1v2
450000 + -0.4v + -1v2 = v2 + -1v2

Combine like terms: v2 + -1v2 = 0
450000 + -0.4v + -1v2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-450000 + 0.4v + v2 = 0

Move the constant term to the right:

Add '450000' to each side of the equation.
-450000 + 0.4v + 450000 + v2 = 0 + 450000

Reorder the terms:
-450000 + 450000 + 0.4v + v2 = 0 + 450000

Combine like terms: -450000 + 450000 = 0
0 + 0.4v + v2 = 0 + 450000
0.4v + v2 = 0 + 450000

Combine like terms: 0 + 450000 = 450000
0.4v + v2 = 450000

The v term is 0.4v.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4v + 0.04 + v2 = 450000 + 0.04

Reorder the terms:
0.04 + 0.4v + v2 = 450000 + 0.04

Combine like terms: 450000 + 0.04 = 450000.04
0.04 + 0.4v + v2 = 450000.04

Factor a perfect square on the left side:
(v + 0.2)(v + 0.2) = 450000.04

Calculate the square root of the right side: 670.820423064

Break this problem into two subproblems by setting 
(v + 0.2) equal to 670.820423064 and -670.820423064.

Subproblem 1

v + 0.2 = 670.820423064 Simplifying v + 0.2 = 670.820423064 Reorder the terms: 0.2 + v = 670.820423064 Solving 0.2 + v = 670.820423064 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + v = 670.820423064 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + v = 670.820423064 + -0.2 v = 670.820423064 + -0.2 Combine like terms: 670.820423064 + -0.2 = 670.620423064 v = 670.620423064 Simplifying v = 670.620423064

Subproblem 2

v + 0.2 = -670.820423064 Simplifying v + 0.2 = -670.820423064 Reorder the terms: 0.2 + v = -670.820423064 Solving 0.2 + v = -670.820423064 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + v = -670.820423064 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + v = -670.820423064 + -0.2 v = -670.820423064 + -0.2 Combine like terms: -670.820423064 + -0.2 = -671.020423064 v = -671.020423064 Simplifying v = -671.020423064

Solution

The solution to the problem is based on the solutions from the subproblems. v = {670.620423064, -671.020423064}

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