(x+3)(x-1)=8

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Solution for (x+3)(x-1)=8 equation:


Simplifying
(x + 3)(x + -1) = 8

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

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

Multiply (3 + x) * (-1 + x)
(3(-1 + x) + x(-1 + x)) = 8
((-1 * 3 + x * 3) + x(-1 + x)) = 8
((-3 + 3x) + x(-1 + x)) = 8
(-3 + 3x + (-1 * x + x * x)) = 8
(-3 + 3x + (-1x + x2)) = 8

Combine like terms: 3x + -1x = 2x
(-3 + 2x + x2) = 8

Solving
-3 + 2x + x2 = 8

Solving for variable 'x'.

Reorder the terms:
-3 + -8 + 2x + x2 = 8 + -8

Combine like terms: -3 + -8 = -11
-11 + 2x + x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-11 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 2x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 2x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 2x + x2 = 0 + 11
2x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
2x + x2 = 11

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 = 11 + 1

Reorder the terms:
1 + 2x + x2 = 11 + 1

Combine like terms: 11 + 1 = 12
1 + 2x + x2 = 12

Factor a perfect square on the left side:
(x + 1)(x + 1) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(x + 1) equal to 3.464101615 and -3.464101615.

Subproblem 1

x + 1 = 3.464101615 Simplifying x + 1 = 3.464101615 Reorder the terms: 1 + x = 3.464101615 Solving 1 + x = 3.464101615 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 = 3.464101615 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.464101615 + -1 x = 3.464101615 + -1 Combine like terms: 3.464101615 + -1 = 2.464101615 x = 2.464101615 Simplifying x = 2.464101615

Subproblem 2

x + 1 = -3.464101615 Simplifying x + 1 = -3.464101615 Reorder the terms: 1 + x = -3.464101615 Solving 1 + x = -3.464101615 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 = -3.464101615 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.464101615 + -1 x = -3.464101615 + -1 Combine like terms: -3.464101615 + -1 = -4.464101615 x = -4.464101615 Simplifying x = -4.464101615

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.464101615, -4.464101615}

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