x+(5x(x+8))=124

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Solution for x+(5x(x+8))=124 equation:


Simplifying
x + (5x(x + 8)) = 124

Reorder the terms:
x + (5x(8 + x)) = 124
x + ((8 * 5x + x * 5x)) = 124
x + ((40x + 5x2)) = 124
x + (40x + 5x2) = 124

Remove parenthesis around (40x + 5x2)
x + 40x + 5x2 = 124

Combine like terms: x + 40x = 41x
41x + 5x2 = 124

Solving
41x + 5x2 = 124

Solving for variable 'x'.

Reorder the terms:
-124 + 41x + 5x2 = 124 + -124

Combine like terms: 124 + -124 = 0
-124 + 41x + 5x2 = 0

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

Divide each side by '5'.
-24.8 + 8.2x + x2 = 0

Move the constant term to the right:

Add '24.8' to each side of the equation.
-24.8 + 8.2x + 24.8 + x2 = 0 + 24.8

Reorder the terms:
-24.8 + 24.8 + 8.2x + x2 = 0 + 24.8

Combine like terms: -24.8 + 24.8 = 0.0
0.0 + 8.2x + x2 = 0 + 24.8
8.2x + x2 = 0 + 24.8

Combine like terms: 0 + 24.8 = 24.8
8.2x + x2 = 24.8

The x term is 8.2x.  Take half its coefficient (4.1).
Square it (16.81) and add it to both sides.

Add '16.81' to each side of the equation.
8.2x + 16.81 + x2 = 24.8 + 16.81

Reorder the terms:
16.81 + 8.2x + x2 = 24.8 + 16.81

Combine like terms: 24.8 + 16.81 = 41.61
16.81 + 8.2x + x2 = 41.61

Factor a perfect square on the left side:
(x + 4.1)(x + 4.1) = 41.61

Calculate the square root of the right side: 6.450581369

Break this problem into two subproblems by setting 
(x + 4.1) equal to 6.450581369 and -6.450581369.

Subproblem 1

x + 4.1 = 6.450581369 Simplifying x + 4.1 = 6.450581369 Reorder the terms: 4.1 + x = 6.450581369 Solving 4.1 + x = 6.450581369 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.1' to each side of the equation. 4.1 + -4.1 + x = 6.450581369 + -4.1 Combine like terms: 4.1 + -4.1 = 0.0 0.0 + x = 6.450581369 + -4.1 x = 6.450581369 + -4.1 Combine like terms: 6.450581369 + -4.1 = 2.350581369 x = 2.350581369 Simplifying x = 2.350581369

Subproblem 2

x + 4.1 = -6.450581369 Simplifying x + 4.1 = -6.450581369 Reorder the terms: 4.1 + x = -6.450581369 Solving 4.1 + x = -6.450581369 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.1' to each side of the equation. 4.1 + -4.1 + x = -6.450581369 + -4.1 Combine like terms: 4.1 + -4.1 = 0.0 0.0 + x = -6.450581369 + -4.1 x = -6.450581369 + -4.1 Combine like terms: -6.450581369 + -4.1 = -10.550581369 x = -10.550581369 Simplifying x = -10.550581369

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.350581369, -10.550581369}

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