(x-2)(x+4)=6

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Solution for (x-2)(x+4)=6 equation:


Simplifying
(x + -2)(x + 4) = 6

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

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

Multiply (-2 + x) * (4 + x)
(-2(4 + x) + x(4 + x)) = 6
((4 * -2 + x * -2) + x(4 + x)) = 6
((-8 + -2x) + x(4 + x)) = 6
(-8 + -2x + (4 * x + x * x)) = 6
(-8 + -2x + (4x + x2)) = 6

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

Solving
-8 + 2x + x2 = 6

Solving for variable 'x'.

Reorder the terms:
-8 + -6 + 2x + x2 = 6 + -6

Combine like terms: -8 + -6 = -14
-14 + 2x + x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-14 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 2x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + 2x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 2x + x2 = 0 + 14
2x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
2x + x2 = 14

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 14 + 1

Reorder the terms:
1 + 2x + x2 = 14 + 1

Combine like terms: 14 + 1 = 15
1 + 2x + x2 = 15

Factor a perfect square on the left side:
(x + 1)(x + 1) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(x + 1) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + 1 = 3.872983346 Simplifying x + 1 = 3.872983346 Reorder the terms: 1 + x = 3.872983346 Solving 1 + x = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 3.872983346 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.872983346 + -1 x = 3.872983346 + -1 Combine like terms: 3.872983346 + -1 = 2.872983346 x = 2.872983346 Simplifying x = 2.872983346

Subproblem 2

x + 1 = -3.872983346 Simplifying x + 1 = -3.872983346 Reorder the terms: 1 + x = -3.872983346 Solving 1 + x = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -3.872983346 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.872983346 + -1 x = -3.872983346 + -1 Combine like terms: -3.872983346 + -1 = -4.872983346 x = -4.872983346 Simplifying x = -4.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.872983346, -4.872983346}

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