(x+5)(x-1)=(x+1)2

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Solution for (x+5)(x-1)=(x+1)2 equation:


Simplifying
(x + 5)(x + -1) = (x + 1) * 2

Reorder the terms:
(5 + x)(x + -1) = (x + 1) * 2

Reorder the terms:
(5 + x)(-1 + x) = (x + 1) * 2

Multiply (5 + x) * (-1 + x)
(5(-1 + x) + x(-1 + x)) = (x + 1) * 2
((-1 * 5 + x * 5) + x(-1 + x)) = (x + 1) * 2
((-5 + 5x) + x(-1 + x)) = (x + 1) * 2
(-5 + 5x + (-1 * x + x * x)) = (x + 1) * 2
(-5 + 5x + (-1x + x2)) = (x + 1) * 2

Combine like terms: 5x + -1x = 4x
(-5 + 4x + x2) = (x + 1) * 2

Reorder the terms:
-5 + 4x + x2 = (1 + x) * 2

Reorder the terms for easier multiplication:
-5 + 4x + x2 = 2(1 + x)
-5 + 4x + x2 = (1 * 2 + x * 2)
-5 + 4x + x2 = (2 + 2x)

Solving
-5 + 4x + x2 = 2 + 2x

Solving for variable 'x'.

Reorder the terms:
-5 + -2 + 4x + -2x + x2 = 2 + 2x + -2 + -2x

Combine like terms: -5 + -2 = -7
-7 + 4x + -2x + x2 = 2 + 2x + -2 + -2x

Combine like terms: 4x + -2x = 2x
-7 + 2x + x2 = 2 + 2x + -2 + -2x

Reorder the terms:
-7 + 2x + x2 = 2 + -2 + 2x + -2x

Combine like terms: 2 + -2 = 0
-7 + 2x + x2 = 0 + 2x + -2x
-7 + 2x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-7 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 2x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + 2x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 2x + x2 = 0 + 7
2x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
2x + x2 = 7

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 = 7 + 1

Reorder the terms:
1 + 2x + x2 = 7 + 1

Combine like terms: 7 + 1 = 8
1 + 2x + x2 = 8

Factor a perfect square on the left side:
(x + 1)(x + 1) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(x + 1) equal to 2.828427125 and -2.828427125.

Subproblem 1

x + 1 = 2.828427125 Simplifying x + 1 = 2.828427125 Reorder the terms: 1 + x = 2.828427125 Solving 1 + x = 2.828427125 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 = 2.828427125 + -1 Combine like terms: 1 + -1 = 0 0 + x = 2.828427125 + -1 x = 2.828427125 + -1 Combine like terms: 2.828427125 + -1 = 1.828427125 x = 1.828427125 Simplifying x = 1.828427125

Subproblem 2

x + 1 = -2.828427125 Simplifying x + 1 = -2.828427125 Reorder the terms: 1 + x = -2.828427125 Solving 1 + x = -2.828427125 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 = -2.828427125 + -1 Combine like terms: 1 + -1 = 0 0 + x = -2.828427125 + -1 x = -2.828427125 + -1 Combine like terms: -2.828427125 + -1 = -3.828427125 x = -3.828427125 Simplifying x = -3.828427125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.828427125, -3.828427125}

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