x*(82.75-x)=1668

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Solution for x*(82.75-x)=1668 equation:


Simplifying
x(82.75 + -1x) = 1668
(82.75 * x + -1x * x) = 1668
(82.75x + -1x2) = 1668

Solving
82.75x + -1x2 = 1668

Solving for variable 'x'.

Reorder the terms:
-1668 + 82.75x + -1x2 = 1668 + -1668

Combine like terms: 1668 + -1668 = 0
-1668 + 82.75x + -1x2 = 0

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

Divide each side by '-1'.
1668 + -82.75x + x2 = 0

Move the constant term to the right:

Add '-1668' to each side of the equation.
1668 + -82.75x + -1668 + x2 = 0 + -1668

Reorder the terms:
1668 + -1668 + -82.75x + x2 = 0 + -1668

Combine like terms: 1668 + -1668 = 0
0 + -82.75x + x2 = 0 + -1668
-82.75x + x2 = 0 + -1668

Combine like terms: 0 + -1668 = -1668
-82.75x + x2 = -1668

The x term is -82.75x.  Take half its coefficient (-41.375).
Square it (1711.890625) and add it to both sides.

Add '1711.890625' to each side of the equation.
-82.75x + 1711.890625 + x2 = -1668 + 1711.890625

Reorder the terms:
1711.890625 + -82.75x + x2 = -1668 + 1711.890625

Combine like terms: -1668 + 1711.890625 = 43.890625
1711.890625 + -82.75x + x2 = 43.890625

Factor a perfect square on the left side:
(x + -41.375)(x + -41.375) = 43.890625

Calculate the square root of the right side: 6.625

Break this problem into two subproblems by setting 
(x + -41.375) equal to 6.625 and -6.625.

Subproblem 1

x + -41.375 = 6.625 Simplifying x + -41.375 = 6.625 Reorder the terms: -41.375 + x = 6.625 Solving -41.375 + x = 6.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '41.375' to each side of the equation. -41.375 + 41.375 + x = 6.625 + 41.375 Combine like terms: -41.375 + 41.375 = 0.000 0.000 + x = 6.625 + 41.375 x = 6.625 + 41.375 Combine like terms: 6.625 + 41.375 = 48 x = 48 Simplifying x = 48

Subproblem 2

x + -41.375 = -6.625 Simplifying x + -41.375 = -6.625 Reorder the terms: -41.375 + x = -6.625 Solving -41.375 + x = -6.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '41.375' to each side of the equation. -41.375 + 41.375 + x = -6.625 + 41.375 Combine like terms: -41.375 + 41.375 = 0.000 0.000 + x = -6.625 + 41.375 x = -6.625 + 41.375 Combine like terms: -6.625 + 41.375 = 34.75 x = 34.75 Simplifying x = 34.75

Solution

The solution to the problem is based on the solutions from the subproblems. x = {48, 34.75}

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