4x=(x+4)(x-4)

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


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

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

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

Multiply (4 + x) * (-4 + x)
4x = (4(-4 + x) + x(-4 + x))
4x = ((-4 * 4 + x * 4) + x(-4 + x))
4x = ((-16 + 4x) + x(-4 + x))
4x = (-16 + 4x + (-4 * x + x * x))
4x = (-16 + 4x + (-4x + x2))

Combine like terms: 4x + -4x = 0
4x = (-16 + 0 + x2)
4x = (-16 + x2)

Solving
4x = -16 + x2

Solving for variable 'x'.

Reorder the terms:
16 + 4x + -1x2 = -16 + x2 + 16 + -1x2

Reorder the terms:
16 + 4x + -1x2 = -16 + 16 + x2 + -1x2

Combine like terms: -16 + 16 = 0
16 + 4x + -1x2 = 0 + x2 + -1x2
16 + 4x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
16 + 4x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-16 + -4x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -4x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + -4x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -4x + x2 = 0 + 16
-4x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
-4x + x2 = 16

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 16 + 4

Reorder the terms:
4 + -4x + x2 = 16 + 4

Combine like terms: 16 + 4 = 20
4 + -4x + x2 = 20

Factor a perfect square on the left side:
(x + -2)(x + -2) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x + -2) equal to 4.472135955 and -4.472135955.

Subproblem 1

x + -2 = 4.472135955 Simplifying x + -2 = 4.472135955 Reorder the terms: -2 + x = 4.472135955 Solving -2 + x = 4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 4.472135955 + 2 Combine like terms: -2 + 2 = 0 0 + x = 4.472135955 + 2 x = 4.472135955 + 2 Combine like terms: 4.472135955 + 2 = 6.472135955 x = 6.472135955 Simplifying x = 6.472135955

Subproblem 2

x + -2 = -4.472135955 Simplifying x + -2 = -4.472135955 Reorder the terms: -2 + x = -4.472135955 Solving -2 + x = -4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -4.472135955 + 2 Combine like terms: -2 + 2 = 0 0 + x = -4.472135955 + 2 x = -4.472135955 + 2 Combine like terms: -4.472135955 + 2 = -2.472135955 x = -2.472135955 Simplifying x = -2.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.472135955, -2.472135955}

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