x(x+1)+(x+2)=156

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Solution for x(x+1)+(x+2)=156 equation:


Simplifying
x(x + 1) + (x + 2) = 156

Reorder the terms:
x(1 + x) + (x + 2) = 156
(1 * x + x * x) + (x + 2) = 156
(1x + x2) + (x + 2) = 156

Reorder the terms:
1x + x2 + (2 + x) = 156

Remove parenthesis around (2 + x)
1x + x2 + 2 + x = 156

Reorder the terms:
2 + 1x + x + x2 = 156

Combine like terms: 1x + x = 2x
2 + 2x + x2 = 156

Solving
2 + 2x + x2 = 156

Solving for variable 'x'.

Reorder the terms:
2 + -156 + 2x + x2 = 156 + -156

Combine like terms: 2 + -156 = -154
-154 + 2x + x2 = 156 + -156

Combine like terms: 156 + -156 = 0
-154 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '154' to each side of the equation.
-154 + 2x + 154 + x2 = 0 + 154

Reorder the terms:
-154 + 154 + 2x + x2 = 0 + 154

Combine like terms: -154 + 154 = 0
0 + 2x + x2 = 0 + 154
2x + x2 = 0 + 154

Combine like terms: 0 + 154 = 154
2x + x2 = 154

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 = 154 + 1

Reorder the terms:
1 + 2x + x2 = 154 + 1

Combine like terms: 154 + 1 = 155
1 + 2x + x2 = 155

Factor a perfect square on the left side:
(x + 1)(x + 1) = 155

Calculate the square root of the right side: 12.449899598

Break this problem into two subproblems by setting 
(x + 1) equal to 12.449899598 and -12.449899598.

Subproblem 1

x + 1 = 12.449899598 Simplifying x + 1 = 12.449899598 Reorder the terms: 1 + x = 12.449899598 Solving 1 + x = 12.449899598 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 = 12.449899598 + -1 Combine like terms: 1 + -1 = 0 0 + x = 12.449899598 + -1 x = 12.449899598 + -1 Combine like terms: 12.449899598 + -1 = 11.449899598 x = 11.449899598 Simplifying x = 11.449899598

Subproblem 2

x + 1 = -12.449899598 Simplifying x + 1 = -12.449899598 Reorder the terms: 1 + x = -12.449899598 Solving 1 + x = -12.449899598 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 = -12.449899598 + -1 Combine like terms: 1 + -1 = 0 0 + x = -12.449899598 + -1 x = -12.449899598 + -1 Combine like terms: -12.449899598 + -1 = -13.449899598 x = -13.449899598 Simplifying x = -13.449899598

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.449899598, -13.449899598}

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