(x+1)(x-5)=12

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Solution for (x+1)(x-5)=12 equation:


Simplifying
(x + 1)(x + -5) = 12

Reorder the terms:
(1 + x)(x + -5) = 12

Reorder the terms:
(1 + x)(-5 + x) = 12

Multiply (1 + x) * (-5 + x)
(1(-5 + x) + x(-5 + x)) = 12
((-5 * 1 + x * 1) + x(-5 + x)) = 12
((-5 + 1x) + x(-5 + x)) = 12
(-5 + 1x + (-5 * x + x * x)) = 12
(-5 + 1x + (-5x + x2)) = 12

Combine like terms: 1x + -5x = -4x
(-5 + -4x + x2) = 12

Solving
-5 + -4x + x2 = 12

Solving for variable 'x'.

Reorder the terms:
-5 + -12 + -4x + x2 = 12 + -12

Combine like terms: -5 + -12 = -17
-17 + -4x + x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-17 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + -4x + 17 + x2 = 0 + 17

Reorder the terms:
-17 + 17 + -4x + x2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + -4x + x2 = 0 + 17
-4x + x2 = 0 + 17

Combine like terms: 0 + 17 = 17
-4x + x2 = 17

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 17 + 4

Reorder the terms:
4 + -4x + x2 = 17 + 4

Combine like terms: 17 + 4 = 21
4 + -4x + x2 = 21

Factor a perfect square on the left side:
(x + -2)(x + -2) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(x + -2) equal to 4.582575695 and -4.582575695.

Subproblem 1

x + -2 = 4.582575695 Simplifying x + -2 = 4.582575695 Reorder the terms: -2 + x = 4.582575695 Solving -2 + x = 4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 4.582575695 + 2 Combine like terms: -2 + 2 = 0 0 + x = 4.582575695 + 2 x = 4.582575695 + 2 Combine like terms: 4.582575695 + 2 = 6.582575695 x = 6.582575695 Simplifying x = 6.582575695

Subproblem 2

x + -2 = -4.582575695 Simplifying x + -2 = -4.582575695 Reorder the terms: -2 + x = -4.582575695 Solving -2 + x = -4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -4.582575695 + 2 Combine like terms: -2 + 2 = 0 0 + x = -4.582575695 + 2 x = -4.582575695 + 2 Combine like terms: -4.582575695 + 2 = -2.582575695 x = -2.582575695 Simplifying x = -2.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.582575695, -2.582575695}

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