(x+1)*(x-3)-16=0

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Solution for (x+1)*(x-3)-16=0 equation:


Simplifying
(x + 1)(x + -3) + -16 = 0

Reorder the terms:
(1 + x)(x + -3) + -16 = 0

Reorder the terms:
(1 + x)(-3 + x) + -16 = 0

Multiply (1 + x) * (-3 + x)
(1(-3 + x) + x(-3 + x)) + -16 = 0
((-3 * 1 + x * 1) + x(-3 + x)) + -16 = 0
((-3 + 1x) + x(-3 + x)) + -16 = 0
(-3 + 1x + (-3 * x + x * x)) + -16 = 0
(-3 + 1x + (-3x + x2)) + -16 = 0

Combine like terms: 1x + -3x = -2x
(-3 + -2x + x2) + -16 = 0

Reorder the terms:
-3 + -16 + -2x + x2 = 0

Combine like terms: -3 + -16 = -19
-19 + -2x + x2 = 0

Solving
-19 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -2x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + -2x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -2x + x2 = 0 + 19
-2x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
-2x + x2 = 19

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 = 19 + 1

Reorder the terms:
1 + -2x + x2 = 19 + 1

Combine like terms: 19 + 1 = 20
1 + -2x + x2 = 20

Factor a perfect square on the left side:
(x + -1)(x + -1) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x + -1) equal to 4.472135955 and -4.472135955.

Subproblem 1

x + -1 = 4.472135955 Simplifying x + -1 = 4.472135955 Reorder the terms: -1 + x = 4.472135955 Solving -1 + x = 4.472135955 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 = 4.472135955 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.472135955 + 1 x = 4.472135955 + 1 Combine like terms: 4.472135955 + 1 = 5.472135955 x = 5.472135955 Simplifying x = 5.472135955

Subproblem 2

x + -1 = -4.472135955 Simplifying x + -1 = -4.472135955 Reorder the terms: -1 + x = -4.472135955 Solving -1 + x = -4.472135955 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 = -4.472135955 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.472135955 + 1 x = -4.472135955 + 1 Combine like terms: -4.472135955 + 1 = -3.472135955 x = -3.472135955 Simplifying x = -3.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.472135955, -3.472135955}

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