(x-1)(x+3)=15876

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Solution for (x-1)(x+3)=15876 equation:


Simplifying
(x + -1)(x + 3) = 15876

Reorder the terms:
(-1 + x)(x + 3) = 15876

Reorder the terms:
(-1 + x)(3 + x) = 15876

Multiply (-1 + x) * (3 + x)
(-1(3 + x) + x(3 + x)) = 15876
((3 * -1 + x * -1) + x(3 + x)) = 15876
((-3 + -1x) + x(3 + x)) = 15876
(-3 + -1x + (3 * x + x * x)) = 15876
(-3 + -1x + (3x + x2)) = 15876

Combine like terms: -1x + 3x = 2x
(-3 + 2x + x2) = 15876

Solving
-3 + 2x + x2 = 15876

Solving for variable 'x'.

Reorder the terms:
-3 + -15876 + 2x + x2 = 15876 + -15876

Combine like terms: -3 + -15876 = -15879
-15879 + 2x + x2 = 15876 + -15876

Combine like terms: 15876 + -15876 = 0
-15879 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15879' to each side of the equation.
-15879 + 2x + 15879 + x2 = 0 + 15879

Reorder the terms:
-15879 + 15879 + 2x + x2 = 0 + 15879

Combine like terms: -15879 + 15879 = 0
0 + 2x + x2 = 0 + 15879
2x + x2 = 0 + 15879

Combine like terms: 0 + 15879 = 15879
2x + x2 = 15879

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 = 15879 + 1

Reorder the terms:
1 + 2x + x2 = 15879 + 1

Combine like terms: 15879 + 1 = 15880
1 + 2x + x2 = 15880

Factor a perfect square on the left side:
(x + 1)(x + 1) = 15880

Calculate the square root of the right side: 126.015872016

Break this problem into two subproblems by setting 
(x + 1) equal to 126.015872016 and -126.015872016.

Subproblem 1

x + 1 = 126.015872016 Simplifying x + 1 = 126.015872016 Reorder the terms: 1 + x = 126.015872016 Solving 1 + x = 126.015872016 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 = 126.015872016 + -1 Combine like terms: 1 + -1 = 0 0 + x = 126.015872016 + -1 x = 126.015872016 + -1 Combine like terms: 126.015872016 + -1 = 125.015872016 x = 125.015872016 Simplifying x = 125.015872016

Subproblem 2

x + 1 = -126.015872016 Simplifying x + 1 = -126.015872016 Reorder the terms: 1 + x = -126.015872016 Solving 1 + x = -126.015872016 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 = -126.015872016 + -1 Combine like terms: 1 + -1 = 0 0 + x = -126.015872016 + -1 x = -126.015872016 + -1 Combine like terms: -126.015872016 + -1 = -127.015872016 x = -127.015872016 Simplifying x = -127.015872016

Solution

The solution to the problem is based on the solutions from the subproblems. x = {125.015872016, -127.015872016}

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