(16+2x)(12+2x)=369

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Solution for (16+2x)(12+2x)=369 equation:


Simplifying
(16 + 2x)(12 + 2x) = 369

Multiply (16 + 2x) * (12 + 2x)
(16(12 + 2x) + 2x * (12 + 2x)) = 369
((12 * 16 + 2x * 16) + 2x * (12 + 2x)) = 369
((192 + 32x) + 2x * (12 + 2x)) = 369
(192 + 32x + (12 * 2x + 2x * 2x)) = 369
(192 + 32x + (24x + 4x2)) = 369

Combine like terms: 32x + 24x = 56x
(192 + 56x + 4x2) = 369

Solving
192 + 56x + 4x2 = 369

Solving for variable 'x'.

Reorder the terms:
192 + -369 + 56x + 4x2 = 369 + -369

Combine like terms: 192 + -369 = -177
-177 + 56x + 4x2 = 369 + -369

Combine like terms: 369 + -369 = 0
-177 + 56x + 4x2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-44.25 + 14x + x2 = 0

Move the constant term to the right:

Add '44.25' to each side of the equation.
-44.25 + 14x + 44.25 + x2 = 0 + 44.25

Reorder the terms:
-44.25 + 44.25 + 14x + x2 = 0 + 44.25

Combine like terms: -44.25 + 44.25 = 0.00
0.00 + 14x + x2 = 0 + 44.25
14x + x2 = 0 + 44.25

Combine like terms: 0 + 44.25 = 44.25
14x + x2 = 44.25

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 44.25 + 49

Reorder the terms:
49 + 14x + x2 = 44.25 + 49

Combine like terms: 44.25 + 49 = 93.25
49 + 14x + x2 = 93.25

Factor a perfect square on the left side:
(x + 7)(x + 7) = 93.25

Calculate the square root of the right side: 9.656603958

Break this problem into two subproblems by setting 
(x + 7) equal to 9.656603958 and -9.656603958.

Subproblem 1

x + 7 = 9.656603958 Simplifying x + 7 = 9.656603958 Reorder the terms: 7 + x = 9.656603958 Solving 7 + x = 9.656603958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 9.656603958 + -7 Combine like terms: 7 + -7 = 0 0 + x = 9.656603958 + -7 x = 9.656603958 + -7 Combine like terms: 9.656603958 + -7 = 2.656603958 x = 2.656603958 Simplifying x = 2.656603958

Subproblem 2

x + 7 = -9.656603958 Simplifying x + 7 = -9.656603958 Reorder the terms: 7 + x = -9.656603958 Solving 7 + x = -9.656603958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -9.656603958 + -7 Combine like terms: 7 + -7 = 0 0 + x = -9.656603958 + -7 x = -9.656603958 + -7 Combine like terms: -9.656603958 + -7 = -16.656603958 x = -16.656603958 Simplifying x = -16.656603958

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.656603958, -16.656603958}

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