x(x+15)+(x+18)=180

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Solution for x(x+15)+(x+18)=180 equation:


Simplifying
x(x + 15) + (x + 18) = 180

Reorder the terms:
x(15 + x) + (x + 18) = 180
(15 * x + x * x) + (x + 18) = 180
(15x + x2) + (x + 18) = 180

Reorder the terms:
15x + x2 + (18 + x) = 180

Remove parenthesis around (18 + x)
15x + x2 + 18 + x = 180

Reorder the terms:
18 + 15x + x + x2 = 180

Combine like terms: 15x + x = 16x
18 + 16x + x2 = 180

Solving
18 + 16x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
18 + -180 + 16x + x2 = 180 + -180

Combine like terms: 18 + -180 = -162
-162 + 16x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-162 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '162' to each side of the equation.
-162 + 16x + 162 + x2 = 0 + 162

Reorder the terms:
-162 + 162 + 16x + x2 = 0 + 162

Combine like terms: -162 + 162 = 0
0 + 16x + x2 = 0 + 162
16x + x2 = 0 + 162

Combine like terms: 0 + 162 = 162
16x + x2 = 162

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = 162 + 64

Reorder the terms:
64 + 16x + x2 = 162 + 64

Combine like terms: 162 + 64 = 226
64 + 16x + x2 = 226

Factor a perfect square on the left side:
(x + 8)(x + 8) = 226

Calculate the square root of the right side: 15.033296378

Break this problem into two subproblems by setting 
(x + 8) equal to 15.033296378 and -15.033296378.

Subproblem 1

x + 8 = 15.033296378 Simplifying x + 8 = 15.033296378 Reorder the terms: 8 + x = 15.033296378 Solving 8 + x = 15.033296378 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 15.033296378 + -8 Combine like terms: 8 + -8 = 0 0 + x = 15.033296378 + -8 x = 15.033296378 + -8 Combine like terms: 15.033296378 + -8 = 7.033296378 x = 7.033296378 Simplifying x = 7.033296378

Subproblem 2

x + 8 = -15.033296378 Simplifying x + 8 = -15.033296378 Reorder the terms: 8 + x = -15.033296378 Solving 8 + x = -15.033296378 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -15.033296378 + -8 Combine like terms: 8 + -8 = 0 0 + x = -15.033296378 + -8 x = -15.033296378 + -8 Combine like terms: -15.033296378 + -8 = -23.033296378 x = -23.033296378 Simplifying x = -23.033296378

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.033296378, -23.033296378}

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