[(x+5)(x+1)]-x=

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


Simplifying
[(x + 5)(x + 1)] + -1x = 0

Reorder the terms:
[(5 + x)(x + 1)] + -1x = 0

Reorder the terms:
[(5 + x)(1 + x)] + -1x = 0

Multiply (5 + x) * (1 + x)
[(5(1 + x) + x(1 + x))] + -1x = 0
[((1 * 5 + x * 5) + x(1 + x))] + -1x = 0
[((5 + 5x) + x(1 + x))] + -1x = 0
[(5 + 5x + (1 * x + x * x))] + -1x = 0
[(5 + 5x + (1x + x2))] + -1x = 0

Combine like terms: 5x + 1x = 6x
[(5 + 6x + x2)] + -1x = 0
[5 + 6x + x2] + -1x = 0

Remove brackets around [5 + 6x + x2]
5 + 6x + x2 + -1x = 0

Reorder the terms:
5 + 6x + -1x + x2 = 0

Combine like terms: 6x + -1x = 5x
5 + 5x + x2 = 0

Solving
5 + 5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + 5x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + 5x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 5x + x2 = 0 + -5
5x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
5x + x2 = -5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = -5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = -5 + 6.25

Combine like terms: -5 + 6.25 = 1.25
6.25 + 5x + x2 = 1.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 1.25

Calculate the square root of the right side: 1.118033989

Break this problem into two subproblems by setting 
(x + 2.5) equal to 1.118033989 and -1.118033989.

Subproblem 1

x + 2.5 = 1.118033989 Simplifying x + 2.5 = 1.118033989 Reorder the terms: 2.5 + x = 1.118033989 Solving 2.5 + x = 1.118033989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 1.118033989 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 1.118033989 + -2.5 x = 1.118033989 + -2.5 Combine like terms: 1.118033989 + -2.5 = -1.381966011 x = -1.381966011 Simplifying x = -1.381966011

Subproblem 2

x + 2.5 = -1.118033989 Simplifying x + 2.5 = -1.118033989 Reorder the terms: 2.5 + x = -1.118033989 Solving 2.5 + x = -1.118033989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -1.118033989 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -1.118033989 + -2.5 x = -1.118033989 + -2.5 Combine like terms: -1.118033989 + -2.5 = -3.618033989 x = -3.618033989 Simplifying x = -3.618033989

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.381966011, -3.618033989}

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