x=(100x-x^2)-(40x+18)

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Solution for x=(100x-x^2)-(40x+18) equation:


Simplifying
x = (100x + -1x2) + -1(40x + 18)

Remove parenthesis around (100x + -1x2)
x = 100x + -1x2 + -1(40x + 18)

Reorder the terms:
x = 100x + -1x2 + -1(18 + 40x)
x = 100x + -1x2 + (18 * -1 + 40x * -1)
x = 100x + -1x2 + (-18 + -40x)

Reorder the terms:
x = -18 + 100x + -40x + -1x2

Combine like terms: 100x + -40x = 60x
x = -18 + 60x + -1x2

Solving
x = -18 + 60x + -1x2

Solving for variable 'x'.

Reorder the terms:
18 + x + -60x + x2 = -18 + 60x + -1x2 + 18 + -60x + x2

Combine like terms: x + -60x = -59x
18 + -59x + x2 = -18 + 60x + -1x2 + 18 + -60x + x2

Reorder the terms:
18 + -59x + x2 = -18 + 18 + 60x + -60x + -1x2 + x2

Combine like terms: -18 + 18 = 0
18 + -59x + x2 = 0 + 60x + -60x + -1x2 + x2
18 + -59x + x2 = 60x + -60x + -1x2 + x2

Combine like terms: 60x + -60x = 0
18 + -59x + x2 = 0 + -1x2 + x2
18 + -59x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
18 + -59x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + -59x + -18 + x2 = 0 + -18

Reorder the terms:
18 + -18 + -59x + x2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -59x + x2 = 0 + -18
-59x + x2 = 0 + -18

Combine like terms: 0 + -18 = -18
-59x + x2 = -18

The x term is -59x.  Take half its coefficient (-29.5).
Square it (870.25) and add it to both sides.

Add '870.25' to each side of the equation.
-59x + 870.25 + x2 = -18 + 870.25

Reorder the terms:
870.25 + -59x + x2 = -18 + 870.25

Combine like terms: -18 + 870.25 = 852.25
870.25 + -59x + x2 = 852.25

Factor a perfect square on the left side:
(x + -29.5)(x + -29.5) = 852.25

Calculate the square root of the right side: 29.193321154

Break this problem into two subproblems by setting 
(x + -29.5) equal to 29.193321154 and -29.193321154.

Subproblem 1

x + -29.5 = 29.193321154 Simplifying x + -29.5 = 29.193321154 Reorder the terms: -29.5 + x = 29.193321154 Solving -29.5 + x = 29.193321154 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '29.5' to each side of the equation. -29.5 + 29.5 + x = 29.193321154 + 29.5 Combine like terms: -29.5 + 29.5 = 0.0 0.0 + x = 29.193321154 + 29.5 x = 29.193321154 + 29.5 Combine like terms: 29.193321154 + 29.5 = 58.693321154 x = 58.693321154 Simplifying x = 58.693321154

Subproblem 2

x + -29.5 = -29.193321154 Simplifying x + -29.5 = -29.193321154 Reorder the terms: -29.5 + x = -29.193321154 Solving -29.5 + x = -29.193321154 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '29.5' to each side of the equation. -29.5 + 29.5 + x = -29.193321154 + 29.5 Combine like terms: -29.5 + 29.5 = 0.0 0.0 + x = -29.193321154 + 29.5 x = -29.193321154 + 29.5 Combine like terms: -29.193321154 + 29.5 = 0.306678846 x = 0.306678846 Simplifying x = 0.306678846

Solution

The solution to the problem is based on the solutions from the subproblems. x = {58.693321154, 0.306678846}

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