0=.002x^2+1.2x+4

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Solution for 0=.002x^2+1.2x+4 equation:


Simplifying
0 = 0.002x2 + 1.2x + 4

Reorder the terms:
0 = 4 + 1.2x + 0.002x2

Solving
0 = 4 + 1.2x + 0.002x2

Solving for variable 'x'.

Combine like terms: 0 + -4 = -4
-4 + -1.2x + -0.002x2 = 4 + 1.2x + 0.002x2 + -4 + -1.2x + -0.002x2

Reorder the terms:
-4 + -1.2x + -0.002x2 = 4 + -4 + 1.2x + -1.2x + 0.002x2 + -0.002x2

Combine like terms: 4 + -4 = 0
-4 + -1.2x + -0.002x2 = 0 + 1.2x + -1.2x + 0.002x2 + -0.002x2
-4 + -1.2x + -0.002x2 = 1.2x + -1.2x + 0.002x2 + -0.002x2

Combine like terms: 1.2x + -1.2x = 0.0
-4 + -1.2x + -0.002x2 = 0.0 + 0.002x2 + -0.002x2
-4 + -1.2x + -0.002x2 = 0.002x2 + -0.002x2

Combine like terms: 0.002x2 + -0.002x2 = 0.000
-4 + -1.2x + -0.002x2 = 0.000

Begin completing the square.  Divide all terms by
-0.002 the coefficient of the squared term: 

Divide each side by '-0.002'.
2000 + 600x + x2 = 0

Move the constant term to the right:

Add '-2000' to each side of the equation.
2000 + 600x + -2000 + x2 = 0 + -2000

Reorder the terms:
2000 + -2000 + 600x + x2 = 0 + -2000

Combine like terms: 2000 + -2000 = 0
0 + 600x + x2 = 0 + -2000
600x + x2 = 0 + -2000

Combine like terms: 0 + -2000 = -2000
600x + x2 = -2000

The x term is 600x.  Take half its coefficient (300).
Square it (90000) and add it to both sides.

Add '90000' to each side of the equation.
600x + 90000 + x2 = -2000 + 90000

Reorder the terms:
90000 + 600x + x2 = -2000 + 90000

Combine like terms: -2000 + 90000 = 88000
90000 + 600x + x2 = 88000

Factor a perfect square on the left side:
(x + 300)(x + 300) = 88000

Calculate the square root of the right side: 296.647939484

Break this problem into two subproblems by setting 
(x + 300) equal to 296.647939484 and -296.647939484.

Subproblem 1

x + 300 = 296.647939484 Simplifying x + 300 = 296.647939484 Reorder the terms: 300 + x = 296.647939484 Solving 300 + x = 296.647939484 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-300' to each side of the equation. 300 + -300 + x = 296.647939484 + -300 Combine like terms: 300 + -300 = 0 0 + x = 296.647939484 + -300 x = 296.647939484 + -300 Combine like terms: 296.647939484 + -300 = -3.352060516 x = -3.352060516 Simplifying x = -3.352060516

Subproblem 2

x + 300 = -296.647939484 Simplifying x + 300 = -296.647939484 Reorder the terms: 300 + x = -296.647939484 Solving 300 + x = -296.647939484 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-300' to each side of the equation. 300 + -300 + x = -296.647939484 + -300 Combine like terms: 300 + -300 = 0 0 + x = -296.647939484 + -300 x = -296.647939484 + -300 Combine like terms: -296.647939484 + -300 = -596.647939484 x = -596.647939484 Simplifying x = -596.647939484

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.352060516, -596.647939484}

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