(x+1)(x-3)=6

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Solution for (x+1)(x-3)=6 equation:


Simplifying
(x + 1)(x + -3) = 6

Reorder the terms:
(1 + x)(x + -3) = 6

Reorder the terms:
(1 + x)(-3 + x) = 6

Multiply (1 + x) * (-3 + x)
(1(-3 + x) + x(-3 + x)) = 6
((-3 * 1 + x * 1) + x(-3 + x)) = 6
((-3 + 1x) + x(-3 + x)) = 6
(-3 + 1x + (-3 * x + x * x)) = 6
(-3 + 1x + (-3x + x2)) = 6

Combine like terms: 1x + -3x = -2x
(-3 + -2x + x2) = 6

Solving
-3 + -2x + x2 = 6

Solving for variable 'x'.

Reorder the terms:
-3 + -6 + -2x + x2 = 6 + -6

Combine like terms: -3 + -6 = -9
-9 + -2x + x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-9 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -2x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -2x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -2x + x2 = 0 + 9
-2x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-2x + x2 = 9

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 = 9 + 1

Reorder the terms:
1 + -2x + x2 = 9 + 1

Combine like terms: 9 + 1 = 10
1 + -2x + x2 = 10

Factor a perfect square on the left side:
(x + -1)(x + -1) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(x + -1) equal to 3.16227766 and -3.16227766.

Subproblem 1

x + -1 = 3.16227766 Simplifying x + -1 = 3.16227766 Reorder the terms: -1 + x = 3.16227766 Solving -1 + x = 3.16227766 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 = 3.16227766 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.16227766 + 1 x = 3.16227766 + 1 Combine like terms: 3.16227766 + 1 = 4.16227766 x = 4.16227766 Simplifying x = 4.16227766

Subproblem 2

x + -1 = -3.16227766 Simplifying x + -1 = -3.16227766 Reorder the terms: -1 + x = -3.16227766 Solving -1 + x = -3.16227766 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 = -3.16227766 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.16227766 + 1 x = -3.16227766 + 1 Combine like terms: -3.16227766 + 1 = -2.16227766 x = -2.16227766 Simplifying x = -2.16227766

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.16227766, -2.16227766}

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