0.04x^2+8x+200=0

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Solution for 0.04x^2+8x+200=0 equation:


Simplifying
0.04x2 + 8x + 200 = 0

Reorder the terms:
200 + 8x + 0.04x2 = 0

Solving
200 + 8x + 0.04x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.04'.
5000 + 200x + x2 = 0

Move the constant term to the right:

Add '-5000' to each side of the equation.
5000 + 200x + -5000 + x2 = 0 + -5000

Reorder the terms:
5000 + -5000 + 200x + x2 = 0 + -5000

Combine like terms: 5000 + -5000 = 0
0 + 200x + x2 = 0 + -5000
200x + x2 = 0 + -5000

Combine like terms: 0 + -5000 = -5000
200x + x2 = -5000

The x term is 200x.  Take half its coefficient (100).
Square it (10000) and add it to both sides.

Add '10000' to each side of the equation.
200x + 10000 + x2 = -5000 + 10000

Reorder the terms:
10000 + 200x + x2 = -5000 + 10000

Combine like terms: -5000 + 10000 = 5000
10000 + 200x + x2 = 5000

Factor a perfect square on the left side:
(x + 100)(x + 100) = 5000

Calculate the square root of the right side: 70.710678119

Break this problem into two subproblems by setting 
(x + 100) equal to 70.710678119 and -70.710678119.

Subproblem 1

x + 100 = 70.710678119 Simplifying x + 100 = 70.710678119 Reorder the terms: 100 + x = 70.710678119 Solving 100 + x = 70.710678119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + x = 70.710678119 + -100 Combine like terms: 100 + -100 = 0 0 + x = 70.710678119 + -100 x = 70.710678119 + -100 Combine like terms: 70.710678119 + -100 = -29.289321881 x = -29.289321881 Simplifying x = -29.289321881

Subproblem 2

x + 100 = -70.710678119 Simplifying x + 100 = -70.710678119 Reorder the terms: 100 + x = -70.710678119 Solving 100 + x = -70.710678119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + x = -70.710678119 + -100 Combine like terms: 100 + -100 = 0 0 + x = -70.710678119 + -100 x = -70.710678119 + -100 Combine like terms: -70.710678119 + -100 = -170.710678119 x = -170.710678119 Simplifying x = -170.710678119

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-29.289321881, -170.710678119}

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