8000=x^2-18x+56

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Solution for 8000=x^2-18x+56 equation:


Simplifying
8000 = x2 + -18x + 56

Reorder the terms:
8000 = 56 + -18x + x2

Solving
8000 = 56 + -18x + x2

Solving for variable 'x'.

Combine like terms: 8000 + -56 = 7944
7944 + 18x + -1x2 = 56 + -18x + x2 + -56 + 18x + -1x2

Reorder the terms:
7944 + 18x + -1x2 = 56 + -56 + -18x + 18x + x2 + -1x2

Combine like terms: 56 + -56 = 0
7944 + 18x + -1x2 = 0 + -18x + 18x + x2 + -1x2
7944 + 18x + -1x2 = -18x + 18x + x2 + -1x2

Combine like terms: -18x + 18x = 0
7944 + 18x + -1x2 = 0 + x2 + -1x2
7944 + 18x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
7944 + 18x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-7944 + -18x + x2 = 0

Move the constant term to the right:

Add '7944' to each side of the equation.
-7944 + -18x + 7944 + x2 = 0 + 7944

Reorder the terms:
-7944 + 7944 + -18x + x2 = 0 + 7944

Combine like terms: -7944 + 7944 = 0
0 + -18x + x2 = 0 + 7944
-18x + x2 = 0 + 7944

Combine like terms: 0 + 7944 = 7944
-18x + x2 = 7944

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 7944 + 81

Reorder the terms:
81 + -18x + x2 = 7944 + 81

Combine like terms: 7944 + 81 = 8025
81 + -18x + x2 = 8025

Factor a perfect square on the left side:
(x + -9)(x + -9) = 8025

Calculate the square root of the right side: 89.582364336

Break this problem into two subproblems by setting 
(x + -9) equal to 89.582364336 and -89.582364336.

Subproblem 1

x + -9 = 89.582364336 Simplifying x + -9 = 89.582364336 Reorder the terms: -9 + x = 89.582364336 Solving -9 + x = 89.582364336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 89.582364336 + 9 Combine like terms: -9 + 9 = 0 0 + x = 89.582364336 + 9 x = 89.582364336 + 9 Combine like terms: 89.582364336 + 9 = 98.582364336 x = 98.582364336 Simplifying x = 98.582364336

Subproblem 2

x + -9 = -89.582364336 Simplifying x + -9 = -89.582364336 Reorder the terms: -9 + x = -89.582364336 Solving -9 + x = -89.582364336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -89.582364336 + 9 Combine like terms: -9 + 9 = 0 0 + x = -89.582364336 + 9 x = -89.582364336 + 9 Combine like terms: -89.582364336 + 9 = -80.582364336 x = -80.582364336 Simplifying x = -80.582364336

Solution

The solution to the problem is based on the solutions from the subproblems. x = {98.582364336, -80.582364336}

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