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

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


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

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

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

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

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

Solving
-3 + -2x + x2 = 3

Solving for variable 'x'.

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

Combine like terms: -3 + -3 = -6
-6 + -2x + x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-6 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -2x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -2x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -2x + x2 = 0 + 6
-2x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-2x + x2 = 6

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 = 6 + 1

Reorder the terms:
1 + -2x + x2 = 6 + 1

Combine like terms: 6 + 1 = 7
1 + -2x + x2 = 7

Factor a perfect square on the left side:
(x + -1)(x + -1) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(x + -1) equal to 2.645751311 and -2.645751311.

Subproblem 1

x + -1 = 2.645751311 Simplifying x + -1 = 2.645751311 Reorder the terms: -1 + x = 2.645751311 Solving -1 + x = 2.645751311 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 = 2.645751311 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.645751311 + 1 x = 2.645751311 + 1 Combine like terms: 2.645751311 + 1 = 3.645751311 x = 3.645751311 Simplifying x = 3.645751311

Subproblem 2

x + -1 = -2.645751311 Simplifying x + -1 = -2.645751311 Reorder the terms: -1 + x = -2.645751311 Solving -1 + x = -2.645751311 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 = -2.645751311 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.645751311 + 1 x = -2.645751311 + 1 Combine like terms: -2.645751311 + 1 = -1.645751311 x = -1.645751311 Simplifying x = -1.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.645751311, -1.645751311}

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