(8-x)(17-x)=66

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Solution for (8-x)(17-x)=66 equation:


Simplifying
(8 + -1x)(17 + -1x) = 66

Multiply (8 + -1x) * (17 + -1x)
(8(17 + -1x) + -1x * (17 + -1x)) = 66
((17 * 8 + -1x * 8) + -1x * (17 + -1x)) = 66
((136 + -8x) + -1x * (17 + -1x)) = 66
(136 + -8x + (17 * -1x + -1x * -1x)) = 66
(136 + -8x + (-17x + 1x2)) = 66

Combine like terms: -8x + -17x = -25x
(136 + -25x + 1x2) = 66

Solving
136 + -25x + 1x2 = 66

Solving for variable 'x'.

Reorder the terms:
136 + -66 + -25x + 1x2 = 66 + -66

Combine like terms: 136 + -66 = 70
70 + -25x + 1x2 = 66 + -66

Combine like terms: 66 + -66 = 0
70 + -25x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-70' to each side of the equation.
70 + -25x + -70 + x2 = 0 + -70

Reorder the terms:
70 + -70 + -25x + x2 = 0 + -70

Combine like terms: 70 + -70 = 0
0 + -25x + x2 = 0 + -70
-25x + x2 = 0 + -70

Combine like terms: 0 + -70 = -70
-25x + x2 = -70

The x term is -25x.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25x + 156.25 + x2 = -70 + 156.25

Reorder the terms:
156.25 + -25x + x2 = -70 + 156.25

Combine like terms: -70 + 156.25 = 86.25
156.25 + -25x + x2 = 86.25

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = 86.25

Calculate the square root of the right side: 9.287087811

Break this problem into two subproblems by setting 
(x + -12.5) equal to 9.287087811 and -9.287087811.

Subproblem 1

x + -12.5 = 9.287087811 Simplifying x + -12.5 = 9.287087811 Reorder the terms: -12.5 + x = 9.287087811 Solving -12.5 + x = 9.287087811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + x = 9.287087811 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = 9.287087811 + 12.5 x = 9.287087811 + 12.5 Combine like terms: 9.287087811 + 12.5 = 21.787087811 x = 21.787087811 Simplifying x = 21.787087811

Subproblem 2

x + -12.5 = -9.287087811 Simplifying x + -12.5 = -9.287087811 Reorder the terms: -12.5 + x = -9.287087811 Solving -12.5 + x = -9.287087811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + x = -9.287087811 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = -9.287087811 + 12.5 x = -9.287087811 + 12.5 Combine like terms: -9.287087811 + 12.5 = 3.212912189 x = 3.212912189 Simplifying x = 3.212912189

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.787087811, 3.212912189}

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