(12+x)(20+x)=360

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Solution for (12+x)(20+x)=360 equation:


Simplifying
(12 + x)(20 + x) = 360

Multiply (12 + x) * (20 + x)
(12(20 + x) + x(20 + x)) = 360
((20 * 12 + x * 12) + x(20 + x)) = 360
((240 + 12x) + x(20 + x)) = 360
(240 + 12x + (20 * x + x * x)) = 360
(240 + 12x + (20x + x2)) = 360

Combine like terms: 12x + 20x = 32x
(240 + 32x + x2) = 360

Solving
240 + 32x + x2 = 360

Solving for variable 'x'.

Reorder the terms:
240 + -360 + 32x + x2 = 360 + -360

Combine like terms: 240 + -360 = -120
-120 + 32x + x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-120 + 32x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + 32x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + 32x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + 32x + x2 = 0 + 120
32x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
32x + x2 = 120

The x term is 32x.  Take half its coefficient (16).
Square it (256) and add it to both sides.

Add '256' to each side of the equation.
32x + 256 + x2 = 120 + 256

Reorder the terms:
256 + 32x + x2 = 120 + 256

Combine like terms: 120 + 256 = 376
256 + 32x + x2 = 376

Factor a perfect square on the left side:
(x + 16)(x + 16) = 376

Calculate the square root of the right side: 19.39071943

Break this problem into two subproblems by setting 
(x + 16) equal to 19.39071943 and -19.39071943.

Subproblem 1

x + 16 = 19.39071943 Simplifying x + 16 = 19.39071943 Reorder the terms: 16 + x = 19.39071943 Solving 16 + x = 19.39071943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + x = 19.39071943 + -16 Combine like terms: 16 + -16 = 0 0 + x = 19.39071943 + -16 x = 19.39071943 + -16 Combine like terms: 19.39071943 + -16 = 3.39071943 x = 3.39071943 Simplifying x = 3.39071943

Subproblem 2

x + 16 = -19.39071943 Simplifying x + 16 = -19.39071943 Reorder the terms: 16 + x = -19.39071943 Solving 16 + x = -19.39071943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + x = -19.39071943 + -16 Combine like terms: 16 + -16 = 0 0 + x = -19.39071943 + -16 x = -19.39071943 + -16 Combine like terms: -19.39071943 + -16 = -35.39071943 x = -35.39071943 Simplifying x = -35.39071943

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.39071943, -35.39071943}

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