x(x+16)=(x+8)2

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Solution for x(x+16)=(x+8)2 equation:


Simplifying
x(x + 16) = (x + 8) * 2

Reorder the terms:
x(16 + x) = (x + 8) * 2
(16 * x + x * x) = (x + 8) * 2
(16x + x2) = (x + 8) * 2

Reorder the terms:
16x + x2 = (8 + x) * 2

Reorder the terms for easier multiplication:
16x + x2 = 2(8 + x)
16x + x2 = (8 * 2 + x * 2)
16x + x2 = (16 + 2x)

Solving
16x + x2 = 16 + 2x

Solving for variable 'x'.

Reorder the terms:
-16 + 16x + -2x + x2 = 16 + 2x + -16 + -2x

Combine like terms: 16x + -2x = 14x
-16 + 14x + x2 = 16 + 2x + -16 + -2x

Reorder the terms:
-16 + 14x + x2 = 16 + -16 + 2x + -2x

Combine like terms: 16 + -16 = 0
-16 + 14x + x2 = 0 + 2x + -2x
-16 + 14x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-16 + 14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 14x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 14x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 14x + x2 = 0 + 16
14x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
14x + x2 = 16

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 16 + 49

Reorder the terms:
49 + 14x + x2 = 16 + 49

Combine like terms: 16 + 49 = 65
49 + 14x + x2 = 65

Factor a perfect square on the left side:
(x + 7)(x + 7) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(x + 7) equal to 8.062257748 and -8.062257748.

Subproblem 1

x + 7 = 8.062257748 Simplifying x + 7 = 8.062257748 Reorder the terms: 7 + x = 8.062257748 Solving 7 + x = 8.062257748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 8.062257748 + -7 Combine like terms: 7 + -7 = 0 0 + x = 8.062257748 + -7 x = 8.062257748 + -7 Combine like terms: 8.062257748 + -7 = 1.062257748 x = 1.062257748 Simplifying x = 1.062257748

Subproblem 2

x + 7 = -8.062257748 Simplifying x + 7 = -8.062257748 Reorder the terms: 7 + x = -8.062257748 Solving 7 + x = -8.062257748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -8.062257748 + -7 Combine like terms: 7 + -7 = 0 0 + x = -8.062257748 + -7 x = -8.062257748 + -7 Combine like terms: -8.062257748 + -7 = -15.062257748 x = -15.062257748 Simplifying x = -15.062257748

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.062257748, -15.062257748}

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