(x-4)(x-2)=16

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Solution for (x-4)(x-2)=16 equation:


Simplifying
(x + -4)(x + -2) = 16

Reorder the terms:
(-4 + x)(x + -2) = 16

Reorder the terms:
(-4 + x)(-2 + x) = 16

Multiply (-4 + x) * (-2 + x)
(-4(-2 + x) + x(-2 + x)) = 16
((-2 * -4 + x * -4) + x(-2 + x)) = 16
((8 + -4x) + x(-2 + x)) = 16
(8 + -4x + (-2 * x + x * x)) = 16
(8 + -4x + (-2x + x2)) = 16

Combine like terms: -4x + -2x = -6x
(8 + -6x + x2) = 16

Solving
8 + -6x + x2 = 16

Solving for variable 'x'.

Reorder the terms:
8 + -16 + -6x + x2 = 16 + -16

Combine like terms: 8 + -16 = -8
-8 + -6x + x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-8 + -6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -6x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -6x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -6x + x2 = 0 + 8
-6x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-6x + x2 = 8

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 8 + 9

Reorder the terms:
9 + -6x + x2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + -6x + x2 = 17

Factor a perfect square on the left side:
(x + -3)(x + -3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(x + -3) equal to 4.123105626 and -4.123105626.

Subproblem 1

x + -3 = 4.123105626 Simplifying x + -3 = 4.123105626 Reorder the terms: -3 + x = 4.123105626 Solving -3 + x = 4.123105626 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + x = 4.123105626 + 3 x = 4.123105626 + 3 Combine like terms: 4.123105626 + 3 = 7.123105626 x = 7.123105626 Simplifying x = 7.123105626

Subproblem 2

x + -3 = -4.123105626 Simplifying x + -3 = -4.123105626 Reorder the terms: -3 + x = -4.123105626 Solving -3 + x = -4.123105626 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + x = -4.123105626 + 3 x = -4.123105626 + 3 Combine like terms: -4.123105626 + 3 = -1.123105626 x = -1.123105626 Simplifying x = -1.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.123105626, -1.123105626}

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