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

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


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

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

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

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

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

Reorder the terms:
-2 + -1 + 1x + x2 = 5

Combine like terms: -2 + -1 = -3
-3 + 1x + x2 = 5

Solving
-3 + 1x + x2 = 5

Solving for variable 'x'.

Reorder the terms:
-3 + -5 + 1x + x2 = 5 + -5

Combine like terms: -3 + -5 = -8
-8 + 1x + x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-8 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 1x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 1x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 1x + x2 = 0 + 8
1x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
1x + x2 = 8

The x term is 1x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 8 + 0.25

Reorder the terms:
0.25 + x + x2 = 8 + 0.25

Combine like terms: 8 + 0.25 = 8.25
0.25 + x + x2 = 8.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.872281323 and -2.872281323.


Subproblem 1
x + 0.5 = 2.872281323

Simplifying
x + 0.5 = 2.872281323

Reorder the terms:
0.5 + x = 2.872281323

Solving
0.5 + x = 2.872281323

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.5' to each side of the equation.
0.5 + -0.5 + x = 2.872281323 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = 2.872281323 + -0.5
x = 2.872281323 + -0.5

Combine like terms: 2.872281323 + -0.5 = 2.372281323
x = 2.372281323

Simplifying
x = 2.372281323


Subproblem 2
x + 0.5 = -2.872281323

Simplifying
x + 0.5 = -2.872281323

Reorder the terms:
0.5 + x = -2.872281323

Solving
0.5 + x = -2.872281323

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.5' to each side of the equation.
0.5 + -0.5 + x = -2.872281323 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = -2.872281323 + -0.5
x = -2.872281323 + -0.5

Combine like terms: -2.872281323 + -0.5 = -3.372281323
x = -3.372281323

Simplifying
x = -3.372281323


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {2.372281323, -3.372281323}

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