4.6x^2+92x+400=0

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Solution for 4.6x^2+92x+400=0 equation:


Simplifying
4.6x2 + 92x + 400 = 0

Reorder the terms:
400 + 92x + 4.6x2 = 0

Solving
400 + 92x + 4.6x2 = 0

Solving for variable 'x'.

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

Divide each side by '4.6'.
86.95652174 + 20x + x2 = 0

Move the constant term to the right:

Add '-86.95652174' to each side of the equation.
86.95652174 + 20x + -86.95652174 + x2 = 0 + -86.95652174

Reorder the terms:
86.95652174 + -86.95652174 + 20x + x2 = 0 + -86.95652174

Combine like terms: 86.95652174 + -86.95652174 = 0.00000000
0.00000000 + 20x + x2 = 0 + -86.95652174
20x + x2 = 0 + -86.95652174

Combine like terms: 0 + -86.95652174 = -86.95652174
20x + x2 = -86.95652174

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = -86.95652174 + 100

Reorder the terms:
100 + 20x + x2 = -86.95652174 + 100

Combine like terms: -86.95652174 + 100 = 13.04347826
100 + 20x + x2 = 13.04347826

Factor a perfect square on the left side:
(x + 10)(x + 10) = 13.04347826

Calculate the square root of the right side: 3.611575592

Break this problem into two subproblems by setting 
(x + 10) equal to 3.611575592 and -3.611575592.

Subproblem 1

x + 10 = 3.611575592 Simplifying x + 10 = 3.611575592 Reorder the terms: 10 + x = 3.611575592 Solving 10 + x = 3.611575592 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 3.611575592 + -10 Combine like terms: 10 + -10 = 0 0 + x = 3.611575592 + -10 x = 3.611575592 + -10 Combine like terms: 3.611575592 + -10 = -6.388424408 x = -6.388424408 Simplifying x = -6.388424408

Subproblem 2

x + 10 = -3.611575592 Simplifying x + 10 = -3.611575592 Reorder the terms: 10 + x = -3.611575592 Solving 10 + x = -3.611575592 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -3.611575592 + -10 Combine like terms: 10 + -10 = 0 0 + x = -3.611575592 + -10 x = -3.611575592 + -10 Combine like terms: -3.611575592 + -10 = -13.611575592 x = -13.611575592 Simplifying x = -13.611575592

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-6.388424408, -13.611575592}

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