252=(x+1)(2x+1)

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Solution for 252=(x+1)(2x+1) equation:


Simplifying
252 = (x + 1)(2x + 1)

Reorder the terms:
252 = (1 + x)(2x + 1)

Reorder the terms:
252 = (1 + x)(1 + 2x)

Multiply (1 + x) * (1 + 2x)
252 = (1(1 + 2x) + x(1 + 2x))
252 = ((1 * 1 + 2x * 1) + x(1 + 2x))
252 = ((1 + 2x) + x(1 + 2x))
252 = (1 + 2x + (1 * x + 2x * x))
252 = (1 + 2x + (1x + 2x2))

Combine like terms: 2x + 1x = 3x
252 = (1 + 3x + 2x2)

Solving
252 = 1 + 3x + 2x2

Solving for variable 'x'.

Combine like terms: 252 + -1 = 251
251 + -3x + -2x2 = 1 + 3x + 2x2 + -1 + -3x + -2x2

Reorder the terms:
251 + -3x + -2x2 = 1 + -1 + 3x + -3x + 2x2 + -2x2

Combine like terms: 1 + -1 = 0
251 + -3x + -2x2 = 0 + 3x + -3x + 2x2 + -2x2
251 + -3x + -2x2 = 3x + -3x + 2x2 + -2x2

Combine like terms: 3x + -3x = 0
251 + -3x + -2x2 = 0 + 2x2 + -2x2
251 + -3x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
251 + -3x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-125.5 + 1.5x + x2 = 0

Move the constant term to the right:

Add '125.5' to each side of the equation.
-125.5 + 1.5x + 125.5 + x2 = 0 + 125.5

Reorder the terms:
-125.5 + 125.5 + 1.5x + x2 = 0 + 125.5

Combine like terms: -125.5 + 125.5 = 0.0
0.0 + 1.5x + x2 = 0 + 125.5
1.5x + x2 = 0 + 125.5

Combine like terms: 0 + 125.5 = 125.5
1.5x + x2 = 125.5

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 125.5 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 125.5 + 0.5625

Combine like terms: 125.5 + 0.5625 = 126.0625
0.5625 + 1.5x + x2 = 126.0625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 126.0625

Calculate the square root of the right side: 11.227755786

Break this problem into two subproblems by setting 
(x + 0.75) equal to 11.227755786 and -11.227755786.

Subproblem 1

x + 0.75 = 11.227755786 Simplifying x + 0.75 = 11.227755786 Reorder the terms: 0.75 + x = 11.227755786 Solving 0.75 + x = 11.227755786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 11.227755786 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 11.227755786 + -0.75 x = 11.227755786 + -0.75 Combine like terms: 11.227755786 + -0.75 = 10.477755786 x = 10.477755786 Simplifying x = 10.477755786

Subproblem 2

x + 0.75 = -11.227755786 Simplifying x + 0.75 = -11.227755786 Reorder the terms: 0.75 + x = -11.227755786 Solving 0.75 + x = -11.227755786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -11.227755786 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -11.227755786 + -0.75 x = -11.227755786 + -0.75 Combine like terms: -11.227755786 + -0.75 = -11.977755786 x = -11.977755786 Simplifying x = -11.977755786

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.477755786, -11.977755786}

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