3x(x+1)=2

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


Simplifying
3x(x + 1) = 2

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

Solving
3x + 3x2 = 2

Solving for variable 'x'.

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

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

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

Divide each side by '3'.
-0.6666666667 + x + x2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + x + 0.6666666667 + x2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + x + x2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + x + x2 = 0 + 0.6666666667
x + x2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
x + x2 = 0.6666666667

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 0.6666666667 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 0.6666666667 + 0.25

Combine like terms: 0.6666666667 + 0.25 = 0.9166666667
1.25 + x2 = 0.9166666667

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.9166666667

Calculate the square root of the right side: 0.957427108

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.957427108 and -0.957427108.

Subproblem 1

x + 0.5 = 0.957427108 Simplifying x + 0.5 = 0.957427108 Reorder the terms: 0.5 + x = 0.957427108 Solving 0.5 + x = 0.957427108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.957427108 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.957427108 + -0.5 x = 0.957427108 + -0.5 Combine like terms: 0.957427108 + -0.5 = 0.457427108 x = 0.457427108 Simplifying x = 0.457427108

Subproblem 2

x + 0.5 = -0.957427108 Simplifying x + 0.5 = -0.957427108 Reorder the terms: 0.5 + x = -0.957427108 Solving 0.5 + x = -0.957427108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.957427108 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.957427108 + -0.5 x = -0.957427108 + -0.5 Combine like terms: -0.957427108 + -0.5 = -1.457427108 x = -1.457427108 Simplifying x = -1.457427108

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.457427108, -1.457427108}

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