(x-8)(x-10)=1

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Solution for (x-8)(x-10)=1 equation:


Simplifying
(x + -8)(x + -10) = 1

Reorder the terms:
(-8 + x)(x + -10) = 1

Reorder the terms:
(-8 + x)(-10 + x) = 1

Multiply (-8 + x) * (-10 + x)
(-8(-10 + x) + x(-10 + x)) = 1
((-10 * -8 + x * -8) + x(-10 + x)) = 1
((80 + -8x) + x(-10 + x)) = 1
(80 + -8x + (-10 * x + x * x)) = 1
(80 + -8x + (-10x + x2)) = 1

Combine like terms: -8x + -10x = -18x
(80 + -18x + x2) = 1

Solving
80 + -18x + x2 = 1

Solving for variable 'x'.

Reorder the terms:
80 + -1 + -18x + x2 = 1 + -1

Combine like terms: 80 + -1 = 79
79 + -18x + x2 = 1 + -1

Combine like terms: 1 + -1 = 0
79 + -18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-79' to each side of the equation.
79 + -18x + -79 + x2 = 0 + -79

Reorder the terms:
79 + -79 + -18x + x2 = 0 + -79

Combine like terms: 79 + -79 = 0
0 + -18x + x2 = 0 + -79
-18x + x2 = 0 + -79

Combine like terms: 0 + -79 = -79
-18x + x2 = -79

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = -79 + 81

Reorder the terms:
81 + -18x + x2 = -79 + 81

Combine like terms: -79 + 81 = 2
81 + -18x + x2 = 2

Factor a perfect square on the left side:
(x + -9)(x + -9) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(x + -9) equal to 1.414213562 and -1.414213562.

Subproblem 1

x + -9 = 1.414213562 Simplifying x + -9 = 1.414213562 Reorder the terms: -9 + x = 1.414213562 Solving -9 + x = 1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 1.414213562 + 9 Combine like terms: -9 + 9 = 0 0 + x = 1.414213562 + 9 x = 1.414213562 + 9 Combine like terms: 1.414213562 + 9 = 10.414213562 x = 10.414213562 Simplifying x = 10.414213562

Subproblem 2

x + -9 = -1.414213562 Simplifying x + -9 = -1.414213562 Reorder the terms: -9 + x = -1.414213562 Solving -9 + x = -1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -1.414213562 + 9 Combine like terms: -9 + 9 = 0 0 + x = -1.414213562 + 9 x = -1.414213562 + 9 Combine like terms: -1.414213562 + 9 = 7.585786438 x = 7.585786438 Simplifying x = 7.585786438

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.414213562, 7.585786438}

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