(x+800)(x+120)=16500

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Solution for (x+800)(x+120)=16500 equation:


Simplifying
(x + 800)(x + 120) = 16500

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

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

Multiply (800 + x) * (120 + x)
(800(120 + x) + x(120 + x)) = 16500
((120 * 800 + x * 800) + x(120 + x)) = 16500
((96000 + 800x) + x(120 + x)) = 16500
(96000 + 800x + (120 * x + x * x)) = 16500
(96000 + 800x + (120x + x2)) = 16500

Combine like terms: 800x + 120x = 920x
(96000 + 920x + x2) = 16500

Solving
96000 + 920x + x2 = 16500

Solving for variable 'x'.

Reorder the terms:
96000 + -16500 + 920x + x2 = 16500 + -16500

Combine like terms: 96000 + -16500 = 79500
79500 + 920x + x2 = 16500 + -16500

Combine like terms: 16500 + -16500 = 0
79500 + 920x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-79500' to each side of the equation.
79500 + 920x + -79500 + x2 = 0 + -79500

Reorder the terms:
79500 + -79500 + 920x + x2 = 0 + -79500

Combine like terms: 79500 + -79500 = 0
0 + 920x + x2 = 0 + -79500
920x + x2 = 0 + -79500

Combine like terms: 0 + -79500 = -79500
920x + x2 = -79500

The x term is 920x.  Take half its coefficient (460).
Square it (211600) and add it to both sides.

Add '211600' to each side of the equation.
920x + 211600 + x2 = -79500 + 211600

Reorder the terms:
211600 + 920x + x2 = -79500 + 211600

Combine like terms: -79500 + 211600 = 132100
211600 + 920x + x2 = 132100

Factor a perfect square on the left side:
(x + 460)(x + 460) = 132100

Calculate the square root of the right side: 363.455636908

Break this problem into two subproblems by setting 
(x + 460) equal to 363.455636908 and -363.455636908.

Subproblem 1

x + 460 = 363.455636908 Simplifying x + 460 = 363.455636908 Reorder the terms: 460 + x = 363.455636908 Solving 460 + x = 363.455636908 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-460' to each side of the equation. 460 + -460 + x = 363.455636908 + -460 Combine like terms: 460 + -460 = 0 0 + x = 363.455636908 + -460 x = 363.455636908 + -460 Combine like terms: 363.455636908 + -460 = -96.544363092 x = -96.544363092 Simplifying x = -96.544363092

Subproblem 2

x + 460 = -363.455636908 Simplifying x + 460 = -363.455636908 Reorder the terms: 460 + x = -363.455636908 Solving 460 + x = -363.455636908 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-460' to each side of the equation. 460 + -460 + x = -363.455636908 + -460 Combine like terms: 460 + -460 = 0 0 + x = -363.455636908 + -460 x = -363.455636908 + -460 Combine like terms: -363.455636908 + -460 = -823.455636908 x = -823.455636908 Simplifying x = -823.455636908

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-96.544363092, -823.455636908}

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