(x+2)(x+4)=340

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Solution for (x+2)(x+4)=340 equation:


Simplifying
(x + 2)(x + 4) = 340

Reorder the terms:
(2 + x)(x + 4) = 340

Reorder the terms:
(2 + x)(4 + x) = 340

Multiply (2 + x) * (4 + x)
(2(4 + x) + x(4 + x)) = 340
((4 * 2 + x * 2) + x(4 + x)) = 340
((8 + 2x) + x(4 + x)) = 340
(8 + 2x + (4 * x + x * x)) = 340
(8 + 2x + (4x + x2)) = 340

Combine like terms: 2x + 4x = 6x
(8 + 6x + x2) = 340

Solving
8 + 6x + x2 = 340

Solving for variable 'x'.

Reorder the terms:
8 + -340 + 6x + x2 = 340 + -340

Combine like terms: 8 + -340 = -332
-332 + 6x + x2 = 340 + -340

Combine like terms: 340 + -340 = 0
-332 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '332' to each side of the equation.
-332 + 6x + 332 + x2 = 0 + 332

Reorder the terms:
-332 + 332 + 6x + x2 = 0 + 332

Combine like terms: -332 + 332 = 0
0 + 6x + x2 = 0 + 332
6x + x2 = 0 + 332

Combine like terms: 0 + 332 = 332
6x + x2 = 332

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 = 332 + 9

Reorder the terms:
9 + 6x + x2 = 332 + 9

Combine like terms: 332 + 9 = 341
9 + 6x + x2 = 341

Factor a perfect square on the left side:
(x + 3)(x + 3) = 341

Calculate the square root of the right side: 18.466185313

Break this problem into two subproblems by setting 
(x + 3) equal to 18.466185313 and -18.466185313.

Subproblem 1

x + 3 = 18.466185313 Simplifying x + 3 = 18.466185313 Reorder the terms: 3 + x = 18.466185313 Solving 3 + x = 18.466185313 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 = 18.466185313 + -3 Combine like terms: 3 + -3 = 0 0 + x = 18.466185313 + -3 x = 18.466185313 + -3 Combine like terms: 18.466185313 + -3 = 15.466185313 x = 15.466185313 Simplifying x = 15.466185313

Subproblem 2

x + 3 = -18.466185313 Simplifying x + 3 = -18.466185313 Reorder the terms: 3 + x = -18.466185313 Solving 3 + x = -18.466185313 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 = -18.466185313 + -3 Combine like terms: 3 + -3 = 0 0 + x = -18.466185313 + -3 x = -18.466185313 + -3 Combine like terms: -18.466185313 + -3 = -21.466185313 x = -21.466185313 Simplifying x = -21.466185313

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.466185313, -21.466185313}

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