70=.04v^2-.5v

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Solution for 70=.04v^2-.5v equation:


Simplifying
70 = 0.04v2 + -0.5v

Reorder the terms:
70 = -0.5v + 0.04v2

Solving
70 = -0.5v + 0.04v2

Solving for variable 'v'.

Reorder the terms:
70 + 0.5v + -0.04v2 = -0.5v + 0.5v + 0.04v2 + -0.04v2

Combine like terms: -0.5v + 0.5v = 0.0
70 + 0.5v + -0.04v2 = 0.0 + 0.04v2 + -0.04v2
70 + 0.5v + -0.04v2 = 0.04v2 + -0.04v2

Combine like terms: 0.04v2 + -0.04v2 = 0.00
70 + 0.5v + -0.04v2 = 0.00

Begin completing the square.  Divide all terms by
-0.04 the coefficient of the squared term: 

Divide each side by '-0.04'.
-1750 + -12.5v + v2 = 0

Move the constant term to the right:

Add '1750' to each side of the equation.
-1750 + -12.5v + 1750 + v2 = 0 + 1750

Reorder the terms:
-1750 + 1750 + -12.5v + v2 = 0 + 1750

Combine like terms: -1750 + 1750 = 0
0 + -12.5v + v2 = 0 + 1750
-12.5v + v2 = 0 + 1750

Combine like terms: 0 + 1750 = 1750
-12.5v + v2 = 1750

The v term is -12.5v.  Take half its coefficient (-6.25).
Square it (39.0625) and add it to both sides.

Add '39.0625' to each side of the equation.
-12.5v + 39.0625 + v2 = 1750 + 39.0625

Reorder the terms:
39.0625 + -12.5v + v2 = 1750 + 39.0625

Combine like terms: 1750 + 39.0625 = 1789.0625
39.0625 + -12.5v + v2 = 1789.0625

Factor a perfect square on the left side:
(v + -6.25)(v + -6.25) = 1789.0625

Calculate the square root of the right side: 42.297310789

Break this problem into two subproblems by setting 
(v + -6.25) equal to 42.297310789 and -42.297310789.

Subproblem 1

v + -6.25 = 42.297310789 Simplifying v + -6.25 = 42.297310789 Reorder the terms: -6.25 + v = 42.297310789 Solving -6.25 + v = 42.297310789 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + v = 42.297310789 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + v = 42.297310789 + 6.25 v = 42.297310789 + 6.25 Combine like terms: 42.297310789 + 6.25 = 48.547310789 v = 48.547310789 Simplifying v = 48.547310789

Subproblem 2

v + -6.25 = -42.297310789 Simplifying v + -6.25 = -42.297310789 Reorder the terms: -6.25 + v = -42.297310789 Solving -6.25 + v = -42.297310789 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + v = -42.297310789 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + v = -42.297310789 + 6.25 v = -42.297310789 + 6.25 Combine like terms: -42.297310789 + 6.25 = -36.047310789 v = -36.047310789 Simplifying v = -36.047310789

Solution

The solution to the problem is based on the solutions from the subproblems. v = {48.547310789, -36.047310789}

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