x(138-x)=126

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Solution for x(138-x)=126 equation:


Simplifying
x(138 + -1x) = 126
(138 * x + -1x * x) = 126
(138x + -1x2) = 126

Solving
138x + -1x2 = 126

Solving for variable 'x'.

Reorder the terms:
-126 + 138x + -1x2 = 126 + -126

Combine like terms: 126 + -126 = 0
-126 + 138x + -1x2 = 0

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

Divide each side by '-1'.
126 + -138x + x2 = 0

Move the constant term to the right:

Add '-126' to each side of the equation.
126 + -138x + -126 + x2 = 0 + -126

Reorder the terms:
126 + -126 + -138x + x2 = 0 + -126

Combine like terms: 126 + -126 = 0
0 + -138x + x2 = 0 + -126
-138x + x2 = 0 + -126

Combine like terms: 0 + -126 = -126
-138x + x2 = -126

The x term is -138x.  Take half its coefficient (-69).
Square it (4761) and add it to both sides.

Add '4761' to each side of the equation.
-138x + 4761 + x2 = -126 + 4761

Reorder the terms:
4761 + -138x + x2 = -126 + 4761

Combine like terms: -126 + 4761 = 4635
4761 + -138x + x2 = 4635

Factor a perfect square on the left side:
(x + -69)(x + -69) = 4635

Calculate the square root of the right side: 68.080834307

Break this problem into two subproblems by setting 
(x + -69) equal to 68.080834307 and -68.080834307.

Subproblem 1

x + -69 = 68.080834307 Simplifying x + -69 = 68.080834307 Reorder the terms: -69 + x = 68.080834307 Solving -69 + x = 68.080834307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '69' to each side of the equation. -69 + 69 + x = 68.080834307 + 69 Combine like terms: -69 + 69 = 0 0 + x = 68.080834307 + 69 x = 68.080834307 + 69 Combine like terms: 68.080834307 + 69 = 137.080834307 x = 137.080834307 Simplifying x = 137.080834307

Subproblem 2

x + -69 = -68.080834307 Simplifying x + -69 = -68.080834307 Reorder the terms: -69 + x = -68.080834307 Solving -69 + x = -68.080834307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '69' to each side of the equation. -69 + 69 + x = -68.080834307 + 69 Combine like terms: -69 + 69 = 0 0 + x = -68.080834307 + 69 x = -68.080834307 + 69 Combine like terms: -68.080834307 + 69 = 0.919165693 x = 0.919165693 Simplifying x = 0.919165693

Solution

The solution to the problem is based on the solutions from the subproblems. x = {137.080834307, 0.919165693}

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