-0.002x^2+1.2x+4=0

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Solution for -0.002x^2+1.2x+4=0 equation:


Simplifying
-0.002x2 + 1.2x + 4 = 0

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

Solving
4 + 1.2x + -0.002x2 = 0

Solving for variable 'x'.

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 = 92000
90000 + -600x + x2 = 92000

Factor a perfect square on the left side:
(x + -300)(x + -300) = 92000

Calculate the square root of the right side: 303.315017762

Break this problem into two subproblems by setting 
(x + -300) equal to 303.315017762 and -303.315017762.

Subproblem 1

x + -300 = 303.315017762 Simplifying x + -300 = 303.315017762 Reorder the terms: -300 + x = 303.315017762 Solving -300 + x = 303.315017762 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 = 303.315017762 + 300 Combine like terms: -300 + 300 = 0 0 + x = 303.315017762 + 300 x = 303.315017762 + 300 Combine like terms: 303.315017762 + 300 = 603.315017762 x = 603.315017762 Simplifying x = 603.315017762

Subproblem 2

x + -300 = -303.315017762 Simplifying x + -300 = -303.315017762 Reorder the terms: -300 + x = -303.315017762 Solving -300 + x = -303.315017762 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 = -303.315017762 + 300 Combine like terms: -300 + 300 = 0 0 + x = -303.315017762 + 300 x = -303.315017762 + 300 Combine like terms: -303.315017762 + 300 = -3.315017762 x = -3.315017762 Simplifying x = -3.315017762

Solution

The solution to the problem is based on the solutions from the subproblems. x = {603.315017762, -3.315017762}

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