(x-1)(x+5)=8

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Solution for (x-1)(x+5)=8 equation:


Simplifying
(x + -1)(x + 5) = 8

Reorder the terms:
(-1 + x)(x + 5) = 8

Reorder the terms:
(-1 + x)(5 + x) = 8

Multiply (-1 + x) * (5 + x)
(-1(5 + x) + x(5 + x)) = 8
((5 * -1 + x * -1) + x(5 + x)) = 8
((-5 + -1x) + x(5 + x)) = 8
(-5 + -1x + (5 * x + x * x)) = 8
(-5 + -1x + (5x + x2)) = 8

Combine like terms: -1x + 5x = 4x
(-5 + 4x + x2) = 8

Solving
-5 + 4x + x2 = 8

Solving for variable 'x'.

Reorder the terms:
-5 + -8 + 4x + x2 = 8 + -8

Combine like terms: -5 + -8 = -13
-13 + 4x + x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-13 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 4x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + 4x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 4x + x2 = 0 + 13
4x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
4x + x2 = 13

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 = 13 + 4

Reorder the terms:
4 + 4x + x2 = 13 + 4

Combine like terms: 13 + 4 = 17
4 + 4x + x2 = 17

Factor a perfect square on the left side:
(x + 2)(x + 2) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(x + 2) equal to 4.123105626 and -4.123105626.

Subproblem 1

x + 2 = 4.123105626 Simplifying x + 2 = 4.123105626 Reorder the terms: 2 + x = 4.123105626 Solving 2 + x = 4.123105626 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 = 4.123105626 + -2 Combine like terms: 2 + -2 = 0 0 + x = 4.123105626 + -2 x = 4.123105626 + -2 Combine like terms: 4.123105626 + -2 = 2.123105626 x = 2.123105626 Simplifying x = 2.123105626

Subproblem 2

x + 2 = -4.123105626 Simplifying x + 2 = -4.123105626 Reorder the terms: 2 + x = -4.123105626 Solving 2 + x = -4.123105626 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 = -4.123105626 + -2 Combine like terms: 2 + -2 = 0 0 + x = -4.123105626 + -2 x = -4.123105626 + -2 Combine like terms: -4.123105626 + -2 = -6.123105626 x = -6.123105626 Simplifying x = -6.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.123105626, -6.123105626}

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