(x+2)(x+4)-1=4(x+2x+4)

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Solution for (x+2)(x+4)-1=4(x+2x+4) equation:


Simplifying
(x + 2)(x + 4) + -1 = 4(x + 2x + 4)

Reorder the terms:
(2 + x)(x + 4) + -1 = 4(x + 2x + 4)

Reorder the terms:
(2 + x)(4 + x) + -1 = 4(x + 2x + 4)

Multiply (2 + x) * (4 + x)
(2(4 + x) + x(4 + x)) + -1 = 4(x + 2x + 4)
((4 * 2 + x * 2) + x(4 + x)) + -1 = 4(x + 2x + 4)
((8 + 2x) + x(4 + x)) + -1 = 4(x + 2x + 4)
(8 + 2x + (4 * x + x * x)) + -1 = 4(x + 2x + 4)
(8 + 2x + (4x + x2)) + -1 = 4(x + 2x + 4)

Combine like terms: 2x + 4x = 6x
(8 + 6x + x2) + -1 = 4(x + 2x + 4)

Reorder the terms:
8 + -1 + 6x + x2 = 4(x + 2x + 4)

Combine like terms: 8 + -1 = 7
7 + 6x + x2 = 4(x + 2x + 4)

Reorder the terms:
7 + 6x + x2 = 4(4 + x + 2x)

Combine like terms: x + 2x = 3x
7 + 6x + x2 = 4(4 + 3x)
7 + 6x + x2 = (4 * 4 + 3x * 4)
7 + 6x + x2 = (16 + 12x)

Solving
7 + 6x + x2 = 16 + 12x

Solving for variable 'x'.

Reorder the terms:
7 + -16 + 6x + -12x + x2 = 16 + 12x + -16 + -12x

Combine like terms: 7 + -16 = -9
-9 + 6x + -12x + x2 = 16 + 12x + -16 + -12x

Combine like terms: 6x + -12x = -6x
-9 + -6x + x2 = 16 + 12x + -16 + -12x

Reorder the terms:
-9 + -6x + x2 = 16 + -16 + 12x + -12x

Combine like terms: 16 + -16 = 0
-9 + -6x + x2 = 0 + 12x + -12x
-9 + -6x + x2 = 12x + -12x

Combine like terms: 12x + -12x = 0
-9 + -6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -6x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -6x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -6x + x2 = 0 + 9
-6x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-6x + x2 = 9

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 = 9 + 9

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

Combine like terms: 9 + 9 = 18
9 + -6x + x2 = 18

Factor a perfect square on the left side:
(x + -3)(x + -3) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(x + -3) equal to 4.242640687 and -4.242640687.

Subproblem 1

x + -3 = 4.242640687 Simplifying x + -3 = 4.242640687 Reorder the terms: -3 + x = 4.242640687 Solving -3 + x = 4.242640687 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 = 4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + x = 4.242640687 + 3 x = 4.242640687 + 3 Combine like terms: 4.242640687 + 3 = 7.242640687 x = 7.242640687 Simplifying x = 7.242640687

Subproblem 2

x + -3 = -4.242640687 Simplifying x + -3 = -4.242640687 Reorder the terms: -3 + x = -4.242640687 Solving -3 + x = -4.242640687 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 = -4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + x = -4.242640687 + 3 x = -4.242640687 + 3 Combine like terms: -4.242640687 + 3 = -1.242640687 x = -1.242640687 Simplifying x = -1.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.242640687, -1.242640687}

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