x(x+1)+(x+2)=36

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Solution for x(x+1)+(x+2)=36 equation:


Simplifying
x(x + 1) + (x + 2) = 36

Reorder the terms:
x(1 + x) + (x + 2) = 36
(1 * x + x * x) + (x + 2) = 36
(1x + x2) + (x + 2) = 36

Reorder the terms:
1x + x2 + (2 + x) = 36

Remove parenthesis around (2 + x)
1x + x2 + 2 + x = 36

Reorder the terms:
2 + 1x + x + x2 = 36

Combine like terms: 1x + x = 2x
2 + 2x + x2 = 36

Solving
2 + 2x + x2 = 36

Solving for variable 'x'.

Reorder the terms:
2 + -36 + 2x + x2 = 36 + -36

Combine like terms: 2 + -36 = -34
-34 + 2x + x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-34 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '34' to each side of the equation.
-34 + 2x + 34 + x2 = 0 + 34

Reorder the terms:
-34 + 34 + 2x + x2 = 0 + 34

Combine like terms: -34 + 34 = 0
0 + 2x + x2 = 0 + 34
2x + x2 = 0 + 34

Combine like terms: 0 + 34 = 34
2x + x2 = 34

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 = 34 + 1

Reorder the terms:
1 + 2x + x2 = 34 + 1

Combine like terms: 34 + 1 = 35
1 + 2x + x2 = 35

Factor a perfect square on the left side:
(x + 1)(x + 1) = 35

Calculate the square root of the right side: 5.916079783

Break this problem into two subproblems by setting 
(x + 1) equal to 5.916079783 and -5.916079783.

Subproblem 1

x + 1 = 5.916079783 Simplifying x + 1 = 5.916079783 Reorder the terms: 1 + x = 5.916079783 Solving 1 + x = 5.916079783 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 = 5.916079783 + -1 Combine like terms: 1 + -1 = 0 0 + x = 5.916079783 + -1 x = 5.916079783 + -1 Combine like terms: 5.916079783 + -1 = 4.916079783 x = 4.916079783 Simplifying x = 4.916079783

Subproblem 2

x + 1 = -5.916079783 Simplifying x + 1 = -5.916079783 Reorder the terms: 1 + x = -5.916079783 Solving 1 + x = -5.916079783 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 = -5.916079783 + -1 Combine like terms: 1 + -1 = 0 0 + x = -5.916079783 + -1 x = -5.916079783 + -1 Combine like terms: -5.916079783 + -1 = -6.916079783 x = -6.916079783 Simplifying x = -6.916079783

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.916079783, -6.916079783}

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