9(x+4)+x(x+1)=18

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Solution for 9(x+4)+x(x+1)=18 equation:


Simplifying
9(x + 4) + x(x + 1) = 18

Reorder the terms:
9(4 + x) + x(x + 1) = 18
(4 * 9 + x * 9) + x(x + 1) = 18
(36 + 9x) + x(x + 1) = 18

Reorder the terms:
36 + 9x + x(1 + x) = 18
36 + 9x + (1 * x + x * x) = 18
36 + 9x + (1x + x2) = 18

Combine like terms: 9x + 1x = 10x
36 + 10x + x2 = 18

Solving
36 + 10x + x2 = 18

Solving for variable 'x'.

Reorder the terms:
36 + -18 + 10x + x2 = 18 + -18

Combine like terms: 36 + -18 = 18
18 + 10x + x2 = 18 + -18

Combine like terms: 18 + -18 = 0
18 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + 10x + -18 + x2 = 0 + -18

Reorder the terms:
18 + -18 + 10x + x2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + 10x + x2 = 0 + -18
10x + x2 = 0 + -18

Combine like terms: 0 + -18 = -18
10x + x2 = -18

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = -18 + 25

Reorder the terms:
25 + 10x + x2 = -18 + 25

Combine like terms: -18 + 25 = 7
25 + 10x + x2 = 7

Factor a perfect square on the left side:
(x + 5)(x + 5) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(x + 5) equal to 2.645751311 and -2.645751311.

Subproblem 1

x + 5 = 2.645751311 Simplifying x + 5 = 2.645751311 Reorder the terms: 5 + x = 2.645751311 Solving 5 + x = 2.645751311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 2.645751311 + -5 Combine like terms: 5 + -5 = 0 0 + x = 2.645751311 + -5 x = 2.645751311 + -5 Combine like terms: 2.645751311 + -5 = -2.354248689 x = -2.354248689 Simplifying x = -2.354248689

Subproblem 2

x + 5 = -2.645751311 Simplifying x + 5 = -2.645751311 Reorder the terms: 5 + x = -2.645751311 Solving 5 + x = -2.645751311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -2.645751311 + -5 Combine like terms: 5 + -5 = 0 0 + x = -2.645751311 + -5 x = -2.645751311 + -5 Combine like terms: -2.645751311 + -5 = -7.645751311 x = -7.645751311 Simplifying x = -7.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.354248689, -7.645751311}

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