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

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


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

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

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

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

Combine like terms: 5x + -1x = 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 = 2.582575695 x = 2.582575695 Simplifying x = 2.582575695

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 = -6.582575695 x = -6.582575695 Simplifying x = -6.582575695

Solution

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

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