(11-x)(15-x)=50

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Solution for (11-x)(15-x)=50 equation:


Simplifying
(11 + -1x)(15 + -1x) = 50

Multiply (11 + -1x) * (15 + -1x)
(11(15 + -1x) + -1x * (15 + -1x)) = 50
((15 * 11 + -1x * 11) + -1x * (15 + -1x)) = 50
((165 + -11x) + -1x * (15 + -1x)) = 50
(165 + -11x + (15 * -1x + -1x * -1x)) = 50
(165 + -11x + (-15x + 1x2)) = 50

Combine like terms: -11x + -15x = -26x
(165 + -26x + 1x2) = 50

Solving
165 + -26x + 1x2 = 50

Solving for variable 'x'.

Reorder the terms:
165 + -50 + -26x + 1x2 = 50 + -50

Combine like terms: 165 + -50 = 115
115 + -26x + 1x2 = 50 + -50

Combine like terms: 50 + -50 = 0
115 + -26x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-115' to each side of the equation.
115 + -26x + -115 + x2 = 0 + -115

Reorder the terms:
115 + -115 + -26x + x2 = 0 + -115

Combine like terms: 115 + -115 = 0
0 + -26x + x2 = 0 + -115
-26x + x2 = 0 + -115

Combine like terms: 0 + -115 = -115
-26x + x2 = -115

The x term is -26x.  Take half its coefficient (-13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
-26x + 169 + x2 = -115 + 169

Reorder the terms:
169 + -26x + x2 = -115 + 169

Combine like terms: -115 + 169 = 54
169 + -26x + x2 = 54

Factor a perfect square on the left side:
(x + -13)(x + -13) = 54

Calculate the square root of the right side: 7.348469228

Break this problem into two subproblems by setting 
(x + -13) equal to 7.348469228 and -7.348469228.

Subproblem 1

x + -13 = 7.348469228 Simplifying x + -13 = 7.348469228 Reorder the terms: -13 + x = 7.348469228 Solving -13 + x = 7.348469228 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x = 7.348469228 + 13 Combine like terms: -13 + 13 = 0 0 + x = 7.348469228 + 13 x = 7.348469228 + 13 Combine like terms: 7.348469228 + 13 = 20.348469228 x = 20.348469228 Simplifying x = 20.348469228

Subproblem 2

x + -13 = -7.348469228 Simplifying x + -13 = -7.348469228 Reorder the terms: -13 + x = -7.348469228 Solving -13 + x = -7.348469228 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x = -7.348469228 + 13 Combine like terms: -13 + 13 = 0 0 + x = -7.348469228 + 13 x = -7.348469228 + 13 Combine like terms: -7.348469228 + 13 = 5.651530772 x = 5.651530772 Simplifying x = 5.651530772

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.348469228, 5.651530772}

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