x+2x(x+8)=180

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Solution for x+2x(x+8)=180 equation:


Simplifying
x + 2x(x + 8) = 180

Reorder the terms:
x + 2x(8 + x) = 180
x + (8 * 2x + x * 2x) = 180
x + (16x + 2x2) = 180

Combine like terms: x + 16x = 17x
17x + 2x2 = 180

Solving
17x + 2x2 = 180

Solving for variable 'x'.

Reorder the terms:
-180 + 17x + 2x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-180 + 17x + 2x2 = 0

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

Divide each side by '2'.
-90 + 8.5x + x2 = 0

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + 8.5x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + 8.5x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 8.5x + x2 = 0 + 90
8.5x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
8.5x + x2 = 90

The x term is 8.5x.  Take half its coefficient (4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
8.5x + 18.0625 + x2 = 90 + 18.0625

Reorder the terms:
18.0625 + 8.5x + x2 = 90 + 18.0625

Combine like terms: 90 + 18.0625 = 108.0625
18.0625 + 8.5x + x2 = 108.0625

Factor a perfect square on the left side:
(x + 4.25)(x + 4.25) = 108.0625

Calculate the square root of the right side: 10.395311443

Break this problem into two subproblems by setting 
(x + 4.25) equal to 10.395311443 and -10.395311443.

Subproblem 1

x + 4.25 = 10.395311443 Simplifying x + 4.25 = 10.395311443 Reorder the terms: 4.25 + x = 10.395311443 Solving 4.25 + x = 10.395311443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + x = 10.395311443 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + x = 10.395311443 + -4.25 x = 10.395311443 + -4.25 Combine like terms: 10.395311443 + -4.25 = 6.145311443 x = 6.145311443 Simplifying x = 6.145311443

Subproblem 2

x + 4.25 = -10.395311443 Simplifying x + 4.25 = -10.395311443 Reorder the terms: 4.25 + x = -10.395311443 Solving 4.25 + x = -10.395311443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + x = -10.395311443 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + x = -10.395311443 + -4.25 x = -10.395311443 + -4.25 Combine like terms: -10.395311443 + -4.25 = -14.645311443 x = -14.645311443 Simplifying x = -14.645311443

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.145311443, -14.645311443}

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