126=(x+3)(x)(1)

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Solution for 126=(x+3)(x)(1) equation:


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

Reorder the terms:
126 = (3 + x)(x)(1)

Reorder the terms for easier multiplication:
126 = 1x(3 + x)
126 = (3 * 1x + x * 1x)
126 = (3x + 1x2)

Solving
126 = 3x + 1x2

Solving for variable 'x'.

Reorder the terms:
126 + -3x + -1x2 = 3x + -3x + 1x2 + -1x2

Combine like terms: 3x + -3x = 0
126 + -3x + -1x2 = 0 + 1x2 + -1x2
126 + -3x + -1x2 = 1x2 + -1x2

Combine like terms: 1x2 + -1x2 = 0
126 + -3x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-126 + 3x + x2 = 0

Move the constant term to the right:

Add '126' to each side of the equation.
-126 + 3x + 126 + x2 = 0 + 126

Reorder the terms:
-126 + 126 + 3x + x2 = 0 + 126

Combine like terms: -126 + 126 = 0
0 + 3x + x2 = 0 + 126
3x + x2 = 0 + 126

Combine like terms: 0 + 126 = 126
3x + x2 = 126

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 126 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 126 + 2.25

Combine like terms: 126 + 2.25 = 128.25
2.25 + 3x + x2 = 128.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 128.25

Calculate the square root of the right side: 11.324751653

Break this problem into two subproblems by setting 
(x + 1.5) equal to 11.324751653 and -11.324751653.

Subproblem 1

x + 1.5 = 11.324751653 Simplifying x + 1.5 = 11.324751653 Reorder the terms: 1.5 + x = 11.324751653 Solving 1.5 + x = 11.324751653 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 11.324751653 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 11.324751653 + -1.5 x = 11.324751653 + -1.5 Combine like terms: 11.324751653 + -1.5 = 9.824751653 x = 9.824751653 Simplifying x = 9.824751653

Subproblem 2

x + 1.5 = -11.324751653 Simplifying x + 1.5 = -11.324751653 Reorder the terms: 1.5 + x = -11.324751653 Solving 1.5 + x = -11.324751653 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -11.324751653 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -11.324751653 + -1.5 x = -11.324751653 + -1.5 Combine like terms: -11.324751653 + -1.5 = -12.824751653 x = -12.824751653 Simplifying x = -12.824751653

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.824751653, -12.824751653}

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