(x+2)(x+4)=100

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Solution for (x+2)(x+4)=100 equation:


Simplifying
(x + 2)(x + 4) = 100

Reorder the terms:
(2 + x)(x + 4) = 100

Reorder the terms:
(2 + x)(4 + x) = 100

Multiply (2 + x) * (4 + x)
(2(4 + x) + x(4 + x)) = 100
((4 * 2 + x * 2) + x(4 + x)) = 100
((8 + 2x) + x(4 + x)) = 100
(8 + 2x + (4 * x + x * x)) = 100
(8 + 2x + (4x + x2)) = 100

Combine like terms: 2x + 4x = 6x
(8 + 6x + x2) = 100

Solving
8 + 6x + x2 = 100

Solving for variable 'x'.

Reorder the terms:
8 + -100 + 6x + x2 = 100 + -100

Combine like terms: 8 + -100 = -92
-92 + 6x + x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-92 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '92' to each side of the equation.
-92 + 6x + 92 + x2 = 0 + 92

Reorder the terms:
-92 + 92 + 6x + x2 = 0 + 92

Combine like terms: -92 + 92 = 0
0 + 6x + x2 = 0 + 92
6x + x2 = 0 + 92

Combine like terms: 0 + 92 = 92
6x + x2 = 92

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 = 92 + 9

Reorder the terms:
9 + 6x + x2 = 92 + 9

Combine like terms: 92 + 9 = 101
9 + 6x + x2 = 101

Factor a perfect square on the left side:
(x + 3)(x + 3) = 101

Calculate the square root of the right side: 10.049875621

Break this problem into two subproblems by setting 
(x + 3) equal to 10.049875621 and -10.049875621.

Subproblem 1

x + 3 = 10.049875621 Simplifying x + 3 = 10.049875621 Reorder the terms: 3 + x = 10.049875621 Solving 3 + x = 10.049875621 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 = 10.049875621 + -3 Combine like terms: 3 + -3 = 0 0 + x = 10.049875621 + -3 x = 10.049875621 + -3 Combine like terms: 10.049875621 + -3 = 7.049875621 x = 7.049875621 Simplifying x = 7.049875621

Subproblem 2

x + 3 = -10.049875621 Simplifying x + 3 = -10.049875621 Reorder the terms: 3 + x = -10.049875621 Solving 3 + x = -10.049875621 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 = -10.049875621 + -3 Combine like terms: 3 + -3 = 0 0 + x = -10.049875621 + -3 x = -10.049875621 + -3 Combine like terms: -10.049875621 + -3 = -13.049875621 x = -13.049875621 Simplifying x = -13.049875621

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.049875621, -13.049875621}

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