x(x+8)=(x+4)

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Solution for x(x+8)=(x+4) equation:


Simplifying
x(x + 8) = (x + 4)

Reorder the terms:
x(8 + x) = (x + 4)
(8 * x + x * x) = (x + 4)
(8x + x2) = (x + 4)

Reorder the terms:
8x + x2 = (4 + x)

Remove parenthesis around (4 + x)
8x + x2 = 4 + x

Solving
8x + x2 = 4 + x

Solving for variable 'x'.

Reorder the terms:
-4 + 8x + -1x + x2 = 4 + x + -4 + -1x

Combine like terms: 8x + -1x = 7x
-4 + 7x + x2 = 4 + x + -4 + -1x

Reorder the terms:
-4 + 7x + x2 = 4 + -4 + x + -1x

Combine like terms: 4 + -4 = 0
-4 + 7x + x2 = 0 + x + -1x
-4 + 7x + x2 = x + -1x

Combine like terms: x + -1x = 0
-4 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 7x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 7x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 7x + x2 = 0 + 4
7x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
7x + x2 = 4

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 4 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 4 + 12.25

Combine like terms: 4 + 12.25 = 16.25
12.25 + 7x + x2 = 16.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + 3.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

x + 3.5 = 4.031128874 Simplifying x + 3.5 = 4.031128874 Reorder the terms: 3.5 + x = 4.031128874 Solving 3.5 + x = 4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 4.031128874 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 4.031128874 + -3.5 x = 4.031128874 + -3.5 Combine like terms: 4.031128874 + -3.5 = 0.531128874 x = 0.531128874 Simplifying x = 0.531128874

Subproblem 2

x + 3.5 = -4.031128874 Simplifying x + 3.5 = -4.031128874 Reorder the terms: 3.5 + x = -4.031128874 Solving 3.5 + x = -4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -4.031128874 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -4.031128874 + -3.5 x = -4.031128874 + -3.5 Combine like terms: -4.031128874 + -3.5 = -7.531128874 x = -7.531128874 Simplifying x = -7.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.531128874, -7.531128874}

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