x(x+1)+(x+2)=180

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Solution for x(x+1)+(x+2)=180 equation:


Simplifying
x(x + 1) + (x + 2) = 180

Reorder the terms:
x(1 + x) + (x + 2) = 180
(1 * x + x * x) + (x + 2) = 180
(1x + x2) + (x + 2) = 180

Reorder the terms:
1x + x2 + (2 + x) = 180

Remove parenthesis around (2 + x)
1x + x2 + 2 + x = 180

Reorder the terms:
2 + 1x + x + x2 = 180

Combine like terms: 1x + x = 2x
2 + 2x + x2 = 180

Solving
2 + 2x + x2 = 180

Solving for variable 'x'.

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

Combine like terms: 2 + -180 = -178
-178 + 2x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-178 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '178' to each side of the equation.
-178 + 2x + 178 + x2 = 0 + 178

Reorder the terms:
-178 + 178 + 2x + x2 = 0 + 178

Combine like terms: -178 + 178 = 0
0 + 2x + x2 = 0 + 178
2x + x2 = 0 + 178

Combine like terms: 0 + 178 = 178
2x + x2 = 178

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 178 + 1

Reorder the terms:
1 + 2x + x2 = 178 + 1

Combine like terms: 178 + 1 = 179
1 + 2x + x2 = 179

Factor a perfect square on the left side:
(x + 1)(x + 1) = 179

Calculate the square root of the right side: 13.37908816

Break this problem into two subproblems by setting 
(x + 1) equal to 13.37908816 and -13.37908816.

Subproblem 1

x + 1 = 13.37908816 Simplifying x + 1 = 13.37908816 Reorder the terms: 1 + x = 13.37908816 Solving 1 + x = 13.37908816 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 13.37908816 + -1 Combine like terms: 1 + -1 = 0 0 + x = 13.37908816 + -1 x = 13.37908816 + -1 Combine like terms: 13.37908816 + -1 = 12.37908816 x = 12.37908816 Simplifying x = 12.37908816

Subproblem 2

x + 1 = -13.37908816 Simplifying x + 1 = -13.37908816 Reorder the terms: 1 + x = -13.37908816 Solving 1 + x = -13.37908816 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -13.37908816 + -1 Combine like terms: 1 + -1 = 0 0 + x = -13.37908816 + -1 x = -13.37908816 + -1 Combine like terms: -13.37908816 + -1 = -14.37908816 x = -14.37908816 Simplifying x = -14.37908816

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.37908816, -14.37908816}

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