(x+1)(x-3)=1

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Solution for (x+1)(x-3)=1 equation:


Simplifying
(x + 1)(x + -3) = 1

Reorder the terms:
(1 + x)(x + -3) = 1

Reorder the terms:
(1 + x)(-3 + x) = 1

Multiply (1 + x) * (-3 + x)
(1(-3 + x) + x(-3 + x)) = 1
((-3 * 1 + x * 1) + x(-3 + x)) = 1
((-3 + 1x) + x(-3 + x)) = 1
(-3 + 1x + (-3 * x + x * x)) = 1
(-3 + 1x + (-3x + x2)) = 1

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

Solving
-3 + -2x + x2 = 1

Solving for variable 'x'.

Reorder the terms:
-3 + -1 + -2x + x2 = 1 + -1

Combine like terms: -3 + -1 = -4
-4 + -2x + x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-4 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -2x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -2x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -2x + x2 = 0 + 4
-2x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-2x + x2 = 4

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 = 4 + 1

Reorder the terms:
1 + -2x + x2 = 4 + 1

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

Factor a perfect square on the left side:
(x + -1)(x + -1) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(x + -1) equal to 2.236067978 and -2.236067978.

Subproblem 1

x + -1 = 2.236067978 Simplifying x + -1 = 2.236067978 Reorder the terms: -1 + x = 2.236067978 Solving -1 + x = 2.236067978 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 = 2.236067978 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.236067978 + 1 x = 2.236067978 + 1 Combine like terms: 2.236067978 + 1 = 3.236067978 x = 3.236067978 Simplifying x = 3.236067978

Subproblem 2

x + -1 = -2.236067978 Simplifying x + -1 = -2.236067978 Reorder the terms: -1 + x = -2.236067978 Solving -1 + x = -2.236067978 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 = -2.236067978 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.236067978 + 1 x = -2.236067978 + 1 Combine like terms: -2.236067978 + 1 = -1.236067978 x = -1.236067978 Simplifying x = -1.236067978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.236067978, -1.236067978}

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