(X-5)(2X-4)=5

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Solution for (X-5)(2X-4)=5 equation:


Simplifying
(X + -5)(2X + -4) = 5

Reorder the terms:
(-5 + X)(2X + -4) = 5

Reorder the terms:
(-5 + X)(-4 + 2X) = 5

Multiply (-5 + X) * (-4 + 2X)
(-5(-4 + 2X) + X(-4 + 2X)) = 5
((-4 * -5 + 2X * -5) + X(-4 + 2X)) = 5
((20 + -10X) + X(-4 + 2X)) = 5
(20 + -10X + (-4 * X + 2X * X)) = 5
(20 + -10X + (-4X + 2X2)) = 5

Combine like terms: -10X + -4X = -14X
(20 + -14X + 2X2) = 5

Solving
20 + -14X + 2X2 = 5

Solving for variable 'X'.

Reorder the terms:
20 + -5 + -14X + 2X2 = 5 + -5

Combine like terms: 20 + -5 = 15
15 + -14X + 2X2 = 5 + -5

Combine like terms: 5 + -5 = 0
15 + -14X + 2X2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
7.5 + -7X + X2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -7X + -7.5 + X2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -7X + X2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -7X + X2 = 0 + -7.5
-7X + X2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-7X + X2 = -7.5

The X term is -7X.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7X + 12.25 + X2 = -7.5 + 12.25

Reorder the terms:
12.25 + -7X + X2 = -7.5 + 12.25

Combine like terms: -7.5 + 12.25 = 4.75
12.25 + -7X + X2 = 4.75

Factor a perfect square on the left side:
(X + -3.5)(X + -3.5) = 4.75

Calculate the square root of the right side: 2.179449472

Break this problem into two subproblems by setting 
(X + -3.5) equal to 2.179449472 and -2.179449472.

Subproblem 1

X + -3.5 = 2.179449472 Simplifying X + -3.5 = 2.179449472 Reorder the terms: -3.5 + X = 2.179449472 Solving -3.5 + X = 2.179449472 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + X = 2.179449472 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + X = 2.179449472 + 3.5 X = 2.179449472 + 3.5 Combine like terms: 2.179449472 + 3.5 = 5.679449472 X = 5.679449472 Simplifying X = 5.679449472

Subproblem 2

X + -3.5 = -2.179449472 Simplifying X + -3.5 = -2.179449472 Reorder the terms: -3.5 + X = -2.179449472 Solving -3.5 + X = -2.179449472 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + X = -2.179449472 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + X = -2.179449472 + 3.5 X = -2.179449472 + 3.5 Combine like terms: -2.179449472 + 3.5 = 1.320550528 X = 1.320550528 Simplifying X = 1.320550528

Solution

The solution to the problem is based on the solutions from the subproblems. X = {5.679449472, 1.320550528}

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