2x(x+1)-3=12x-12

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Solution for 2x(x+1)-3=12x-12 equation:


Simplifying
2x(x + 1) + -3 = 12x + -12

Reorder the terms:
2x(1 + x) + -3 = 12x + -12
(1 * 2x + x * 2x) + -3 = 12x + -12
(2x + 2x2) + -3 = 12x + -12

Reorder the terms:
-3 + 2x + 2x2 = 12x + -12

Reorder the terms:
-3 + 2x + 2x2 = -12 + 12x

Solving
-3 + 2x + 2x2 = -12 + 12x

Solving for variable 'x'.

Reorder the terms:
-3 + 12 + 2x + -12x + 2x2 = -12 + 12x + 12 + -12x

Combine like terms: -3 + 12 = 9
9 + 2x + -12x + 2x2 = -12 + 12x + 12 + -12x

Combine like terms: 2x + -12x = -10x
9 + -10x + 2x2 = -12 + 12x + 12 + -12x

Reorder the terms:
9 + -10x + 2x2 = -12 + 12 + 12x + -12x

Combine like terms: -12 + 12 = 0
9 + -10x + 2x2 = 0 + 12x + -12x
9 + -10x + 2x2 = 12x + -12x

Combine like terms: 12x + -12x = 0
9 + -10x + 2x2 = 0

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

Divide each side by '2'.
4.5 + -5x + x2 = 0

Move the constant term to the right:

Add '-4.5' to each side of the equation.
4.5 + -5x + -4.5 + x2 = 0 + -4.5

Reorder the terms:
4.5 + -4.5 + -5x + x2 = 0 + -4.5

Combine like terms: 4.5 + -4.5 = 0.0
0.0 + -5x + x2 = 0 + -4.5
-5x + x2 = 0 + -4.5

Combine like terms: 0 + -4.5 = -4.5
-5x + x2 = -4.5

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = -4.5 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -4.5 + 6.25

Combine like terms: -4.5 + 6.25 = 1.75
6.25 + -5x + x2 = 1.75

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 1.75

Calculate the square root of the right side: 1.322875656

Break this problem into two subproblems by setting 
(x + -2.5) equal to 1.322875656 and -1.322875656.

Subproblem 1

x + -2.5 = 1.322875656 Simplifying x + -2.5 = 1.322875656 Reorder the terms: -2.5 + x = 1.322875656 Solving -2.5 + x = 1.322875656 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 1.322875656 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 1.322875656 + 2.5 x = 1.322875656 + 2.5 Combine like terms: 1.322875656 + 2.5 = 3.822875656 x = 3.822875656 Simplifying x = 3.822875656

Subproblem 2

x + -2.5 = -1.322875656 Simplifying x + -2.5 = -1.322875656 Reorder the terms: -2.5 + x = -1.322875656 Solving -2.5 + x = -1.322875656 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -1.322875656 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -1.322875656 + 2.5 x = -1.322875656 + 2.5 Combine like terms: -1.322875656 + 2.5 = 1.177124344 x = 1.177124344 Simplifying x = 1.177124344

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.822875656, 1.177124344}

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