x(12+x)=18(18)

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Solution for x(12+x)=18(18) equation:


Simplifying
x(12 + x) = 18(18)
(12 * x + x * x) = 18(18)
(12x + x2) = 18(18)

Multiply 18 * 18
12x + x2 = 324

Solving
12x + x2 = 324

Solving for variable 'x'.

Reorder the terms:
-324 + 12x + x2 = 324 + -324

Combine like terms: 324 + -324 = 0
-324 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '324' to each side of the equation.
-324 + 12x + 324 + x2 = 0 + 324

Reorder the terms:
-324 + 324 + 12x + x2 = 0 + 324

Combine like terms: -324 + 324 = 0
0 + 12x + x2 = 0 + 324
12x + x2 = 0 + 324

Combine like terms: 0 + 324 = 324
12x + x2 = 324

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 324 + 36

Reorder the terms:
36 + 12x + x2 = 324 + 36

Combine like terms: 324 + 36 = 360
36 + 12x + x2 = 360

Factor a perfect square on the left side:
(x + 6)(x + 6) = 360

Calculate the square root of the right side: 18.973665961

Break this problem into two subproblems by setting 
(x + 6) equal to 18.973665961 and -18.973665961.

Subproblem 1

x + 6 = 18.973665961 Simplifying x + 6 = 18.973665961 Reorder the terms: 6 + x = 18.973665961 Solving 6 + x = 18.973665961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 18.973665961 + -6 Combine like terms: 6 + -6 = 0 0 + x = 18.973665961 + -6 x = 18.973665961 + -6 Combine like terms: 18.973665961 + -6 = 12.973665961 x = 12.973665961 Simplifying x = 12.973665961

Subproblem 2

x + 6 = -18.973665961 Simplifying x + 6 = -18.973665961 Reorder the terms: 6 + x = -18.973665961 Solving 6 + x = -18.973665961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -18.973665961 + -6 Combine like terms: 6 + -6 = 0 0 + x = -18.973665961 + -6 x = -18.973665961 + -6 Combine like terms: -18.973665961 + -6 = -24.973665961 x = -24.973665961 Simplifying x = -24.973665961

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.973665961, -24.973665961}

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