5x^2=-20x-1

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Solution for 5x^2=-20x-1 equation:


Simplifying
5x2 = -20x + -1

Reorder the terms:
5x2 = -1 + -20x

Solving
5x2 = -1 + -20x

Solving for variable 'x'.

Reorder the terms:
1 + 20x + 5x2 = -1 + -20x + 1 + 20x

Reorder the terms:
1 + 20x + 5x2 = -1 + 1 + -20x + 20x

Combine like terms: -1 + 1 = 0
1 + 20x + 5x2 = 0 + -20x + 20x
1 + 20x + 5x2 = -20x + 20x

Combine like terms: -20x + 20x = 0
1 + 20x + 5x2 = 0

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

Divide each side by '5'.
0.2 + 4x + x2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + 4x + -0.2 + x2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + 4x + x2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + 4x + x2 = 0 + -0.2
4x + x2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
4x + x2 = -0.2

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = -0.2 + 4

Reorder the terms:
4 + 4x + x2 = -0.2 + 4

Combine like terms: -0.2 + 4 = 3.8
4 + 4x + x2 = 3.8

Factor a perfect square on the left side:
(x + 2)(x + 2) = 3.8

Calculate the square root of the right side: 1.949358869

Break this problem into two subproblems by setting 
(x + 2) equal to 1.949358869 and -1.949358869.

Subproblem 1

x + 2 = 1.949358869 Simplifying x + 2 = 1.949358869 Reorder the terms: 2 + x = 1.949358869 Solving 2 + x = 1.949358869 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 1.949358869 + -2 Combine like terms: 2 + -2 = 0 0 + x = 1.949358869 + -2 x = 1.949358869 + -2 Combine like terms: 1.949358869 + -2 = -0.050641131 x = -0.050641131 Simplifying x = -0.050641131

Subproblem 2

x + 2 = -1.949358869 Simplifying x + 2 = -1.949358869 Reorder the terms: 2 + x = -1.949358869 Solving 2 + x = -1.949358869 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -1.949358869 + -2 Combine like terms: 2 + -2 = 0 0 + x = -1.949358869 + -2 x = -1.949358869 + -2 Combine like terms: -1.949358869 + -2 = -3.949358869 x = -3.949358869 Simplifying x = -3.949358869

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.050641131, -3.949358869}

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