(x+8)(x+120)=16500

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Solution for (x+8)(x+120)=16500 equation:


Simplifying
(x + 8)(x + 120) = 16500

Reorder the terms:
(8 + x)(x + 120) = 16500

Reorder the terms:
(8 + x)(120 + x) = 16500

Multiply (8 + x) * (120 + x)
(8(120 + x) + x(120 + x)) = 16500
((120 * 8 + x * 8) + x(120 + x)) = 16500
((960 + 8x) + x(120 + x)) = 16500
(960 + 8x + (120 * x + x * x)) = 16500
(960 + 8x + (120x + x2)) = 16500

Combine like terms: 8x + 120x = 128x
(960 + 128x + x2) = 16500

Solving
960 + 128x + x2 = 16500

Solving for variable 'x'.

Reorder the terms:
960 + -16500 + 128x + x2 = 16500 + -16500

Combine like terms: 960 + -16500 = -15540
-15540 + 128x + x2 = 16500 + -16500

Combine like terms: 16500 + -16500 = 0
-15540 + 128x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15540' to each side of the equation.
-15540 + 128x + 15540 + x2 = 0 + 15540

Reorder the terms:
-15540 + 15540 + 128x + x2 = 0 + 15540

Combine like terms: -15540 + 15540 = 0
0 + 128x + x2 = 0 + 15540
128x + x2 = 0 + 15540

Combine like terms: 0 + 15540 = 15540
128x + x2 = 15540

The x term is 128x.  Take half its coefficient (64).
Square it (4096) and add it to both sides.

Add '4096' to each side of the equation.
128x + 4096 + x2 = 15540 + 4096

Reorder the terms:
4096 + 128x + x2 = 15540 + 4096

Combine like terms: 15540 + 4096 = 19636
4096 + 128x + x2 = 19636

Factor a perfect square on the left side:
(x + 64)(x + 64) = 19636

Calculate the square root of the right side: 140.128512445

Break this problem into two subproblems by setting 
(x + 64) equal to 140.128512445 and -140.128512445.

Subproblem 1

x + 64 = 140.128512445 Simplifying x + 64 = 140.128512445 Reorder the terms: 64 + x = 140.128512445 Solving 64 + x = 140.128512445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-64' to each side of the equation. 64 + -64 + x = 140.128512445 + -64 Combine like terms: 64 + -64 = 0 0 + x = 140.128512445 + -64 x = 140.128512445 + -64 Combine like terms: 140.128512445 + -64 = 76.128512445 x = 76.128512445 Simplifying x = 76.128512445

Subproblem 2

x + 64 = -140.128512445 Simplifying x + 64 = -140.128512445 Reorder the terms: 64 + x = -140.128512445 Solving 64 + x = -140.128512445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-64' to each side of the equation. 64 + -64 + x = -140.128512445 + -64 Combine like terms: 64 + -64 = 0 0 + x = -140.128512445 + -64 x = -140.128512445 + -64 Combine like terms: -140.128512445 + -64 = -204.128512445 x = -204.128512445 Simplifying x = -204.128512445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {76.128512445, -204.128512445}

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