0=-0.005x^2+2x+5

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Solution for 0=-0.005x^2+2x+5 equation:


Simplifying
0 = -0.005x2 + 2x + 5

Reorder the terms:
0 = 5 + 2x + -0.005x2

Solving
0 = 5 + 2x + -0.005x2

Solving for variable 'x'.

Combine like terms: 0 + -5 = -5
-5 + -2x + 0.005x2 = 5 + 2x + -0.005x2 + -5 + -2x + 0.005x2

Reorder the terms:
-5 + -2x + 0.005x2 = 5 + -5 + 2x + -2x + -0.005x2 + 0.005x2

Combine like terms: 5 + -5 = 0
-5 + -2x + 0.005x2 = 0 + 2x + -2x + -0.005x2 + 0.005x2
-5 + -2x + 0.005x2 = 2x + -2x + -0.005x2 + 0.005x2

Combine like terms: 2x + -2x = 0
-5 + -2x + 0.005x2 = 0 + -0.005x2 + 0.005x2
-5 + -2x + 0.005x2 = -0.005x2 + 0.005x2

Combine like terms: -0.005x2 + 0.005x2 = 0.000
-5 + -2x + 0.005x2 = 0.000

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

Divide each side by '0.005'.
-1000 + -400x + x2 = 0

Move the constant term to the right:

Add '1000' to each side of the equation.
-1000 + -400x + 1000 + x2 = 0 + 1000

Reorder the terms:
-1000 + 1000 + -400x + x2 = 0 + 1000

Combine like terms: -1000 + 1000 = 0
0 + -400x + x2 = 0 + 1000
-400x + x2 = 0 + 1000

Combine like terms: 0 + 1000 = 1000
-400x + x2 = 1000

The x term is -400x.  Take half its coefficient (-200).
Square it (40000) and add it to both sides.

Add '40000' to each side of the equation.
-400x + 40000 + x2 = 1000 + 40000

Reorder the terms:
40000 + -400x + x2 = 1000 + 40000

Combine like terms: 1000 + 40000 = 41000
40000 + -400x + x2 = 41000

Factor a perfect square on the left side:
(x + -200)(x + -200) = 41000

Calculate the square root of the right side: 202.484567313

Break this problem into two subproblems by setting 
(x + -200) equal to 202.484567313 and -202.484567313.

Subproblem 1

x + -200 = 202.484567313 Simplifying x + -200 = 202.484567313 Reorder the terms: -200 + x = 202.484567313 Solving -200 + x = 202.484567313 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + x = 202.484567313 + 200 Combine like terms: -200 + 200 = 0 0 + x = 202.484567313 + 200 x = 202.484567313 + 200 Combine like terms: 202.484567313 + 200 = 402.484567313 x = 402.484567313 Simplifying x = 402.484567313

Subproblem 2

x + -200 = -202.484567313 Simplifying x + -200 = -202.484567313 Reorder the terms: -200 + x = -202.484567313 Solving -200 + x = -202.484567313 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + x = -202.484567313 + 200 Combine like terms: -200 + 200 = 0 0 + x = -202.484567313 + 200 x = -202.484567313 + 200 Combine like terms: -202.484567313 + 200 = -2.484567313 x = -2.484567313 Simplifying x = -2.484567313

Solution

The solution to the problem is based on the solutions from the subproblems. x = {402.484567313, -2.484567313}

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