4+125x+5x^2=0

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Solution for 4+125x+5x^2=0 equation:


Simplifying
4 + 125x + 5x2 = 0

Solving
4 + 125x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
0.8 + 25x + x2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 25x + -0.8 + x2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 25x + x2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 25x + x2 = 0 + -0.8
25x + x2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
25x + x2 = -0.8

The x term is 25x.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25x + 156.25 + x2 = -0.8 + 156.25

Reorder the terms:
156.25 + 25x + x2 = -0.8 + 156.25

Combine like terms: -0.8 + 156.25 = 155.45
156.25 + 25x + x2 = 155.45

Factor a perfect square on the left side:
(x + 12.5)(x + 12.5) = 155.45

Calculate the square root of the right side: 12.467958935

Break this problem into two subproblems by setting 
(x + 12.5) equal to 12.467958935 and -12.467958935.

Subproblem 1

x + 12.5 = 12.467958935 Simplifying x + 12.5 = 12.467958935 Reorder the terms: 12.5 + x = 12.467958935 Solving 12.5 + x = 12.467958935 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = 12.467958935 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = 12.467958935 + -12.5 x = 12.467958935 + -12.5 Combine like terms: 12.467958935 + -12.5 = -0.032041065 x = -0.032041065 Simplifying x = -0.032041065

Subproblem 2

x + 12.5 = -12.467958935 Simplifying x + 12.5 = -12.467958935 Reorder the terms: 12.5 + x = -12.467958935 Solving 12.5 + x = -12.467958935 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = -12.467958935 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = -12.467958935 + -12.5 x = -12.467958935 + -12.5 Combine like terms: -12.467958935 + -12.5 = -24.967958935 x = -24.967958935 Simplifying x = -24.967958935

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.032041065, -24.967958935}

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