(x-9)(x-1)=16

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Solution for (x-9)(x-1)=16 equation:


Simplifying
(x + -9)(x + -1) = 16

Reorder the terms:
(-9 + x)(x + -1) = 16

Reorder the terms:
(-9 + x)(-1 + x) = 16

Multiply (-9 + x) * (-1 + x)
(-9(-1 + x) + x(-1 + x)) = 16
((-1 * -9 + x * -9) + x(-1 + x)) = 16
((9 + -9x) + x(-1 + x)) = 16
(9 + -9x + (-1 * x + x * x)) = 16
(9 + -9x + (-1x + x2)) = 16

Combine like terms: -9x + -1x = -10x
(9 + -10x + x2) = 16

Solving
9 + -10x + x2 = 16

Solving for variable 'x'.

Reorder the terms:
9 + -16 + -10x + x2 = 16 + -16

Combine like terms: 9 + -16 = -7
-7 + -10x + x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-7 + -10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -10x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -10x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -10x + x2 = 0 + 7
-10x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-10x + x2 = 7

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 7 + 25

Reorder the terms:
25 + -10x + x2 = 7 + 25

Combine like terms: 7 + 25 = 32
25 + -10x + x2 = 32

Factor a perfect square on the left side:
(x + -5)(x + -5) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(x + -5) equal to 5.656854249 and -5.656854249.

Subproblem 1

x + -5 = 5.656854249 Simplifying x + -5 = 5.656854249 Reorder the terms: -5 + x = 5.656854249 Solving -5 + x = 5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 5.656854249 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.656854249 + 5 x = 5.656854249 + 5 Combine like terms: 5.656854249 + 5 = 10.656854249 x = 10.656854249 Simplifying x = 10.656854249

Subproblem 2

x + -5 = -5.656854249 Simplifying x + -5 = -5.656854249 Reorder the terms: -5 + x = -5.656854249 Solving -5 + x = -5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -5.656854249 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.656854249 + 5 x = -5.656854249 + 5 Combine like terms: -5.656854249 + 5 = -0.656854249 x = -0.656854249 Simplifying x = -0.656854249

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.656854249, -0.656854249}

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