(x+1)(x+3)=132

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Solution for (x+1)(x+3)=132 equation:


Simplifying
(x + 1)(x + 3) = 132

Reorder the terms:
(1 + x)(x + 3) = 132

Reorder the terms:
(1 + x)(3 + x) = 132

Multiply (1 + x) * (3 + x)
(1(3 + x) + x(3 + x)) = 132
((3 * 1 + x * 1) + x(3 + x)) = 132
((3 + 1x) + x(3 + x)) = 132
(3 + 1x + (3 * x + x * x)) = 132
(3 + 1x + (3x + x2)) = 132

Combine like terms: 1x + 3x = 4x
(3 + 4x + x2) = 132

Solving
3 + 4x + x2 = 132

Solving for variable 'x'.

Reorder the terms:
3 + -132 + 4x + x2 = 132 + -132

Combine like terms: 3 + -132 = -129
-129 + 4x + x2 = 132 + -132

Combine like terms: 132 + -132 = 0
-129 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '129' to each side of the equation.
-129 + 4x + 129 + x2 = 0 + 129

Reorder the terms:
-129 + 129 + 4x + x2 = 0 + 129

Combine like terms: -129 + 129 = 0
0 + 4x + x2 = 0 + 129
4x + x2 = 0 + 129

Combine like terms: 0 + 129 = 129
4x + x2 = 129

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 = 129 + 4

Reorder the terms:
4 + 4x + x2 = 129 + 4

Combine like terms: 129 + 4 = 133
4 + 4x + x2 = 133

Factor a perfect square on the left side:
(x + 2)(x + 2) = 133

Calculate the square root of the right side: 11.532562595

Break this problem into two subproblems by setting 
(x + 2) equal to 11.532562595 and -11.532562595.

Subproblem 1

x + 2 = 11.532562595 Simplifying x + 2 = 11.532562595 Reorder the terms: 2 + x = 11.532562595 Solving 2 + x = 11.532562595 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 = 11.532562595 + -2 Combine like terms: 2 + -2 = 0 0 + x = 11.532562595 + -2 x = 11.532562595 + -2 Combine like terms: 11.532562595 + -2 = 9.532562595 x = 9.532562595 Simplifying x = 9.532562595

Subproblem 2

x + 2 = -11.532562595 Simplifying x + 2 = -11.532562595 Reorder the terms: 2 + x = -11.532562595 Solving 2 + x = -11.532562595 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 = -11.532562595 + -2 Combine like terms: 2 + -2 = 0 0 + x = -11.532562595 + -2 x = -11.532562595 + -2 Combine like terms: -11.532562595 + -2 = -13.532562595 x = -13.532562595 Simplifying x = -13.532562595

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.532562595, -13.532562595}

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