6x^2+12x=7

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Solution for 6x^2+12x=7 equation:


Simplifying
6x2 + 12x = 7

Reorder the terms:
12x + 6x2 = 7

Solving
12x + 6x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + 12x + 6x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 12x + 6x2 = 0

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

Divide each side by '6'.
-1.166666667 + 2x + x2 = 0

Move the constant term to the right:

Add '1.166666667' to each side of the equation.
-1.166666667 + 2x + 1.166666667 + x2 = 0 + 1.166666667

Reorder the terms:
-1.166666667 + 1.166666667 + 2x + x2 = 0 + 1.166666667

Combine like terms: -1.166666667 + 1.166666667 = 0.000000000
0.000000000 + 2x + x2 = 0 + 1.166666667
2x + x2 = 0 + 1.166666667

Combine like terms: 0 + 1.166666667 = 1.166666667
2x + x2 = 1.166666667

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 1.166666667 + 1

Reorder the terms:
1 + 2x + x2 = 1.166666667 + 1

Combine like terms: 1.166666667 + 1 = 2.166666667
1 + 2x + x2 = 2.166666667

Factor a perfect square on the left side:
(x + 1)(x + 1) = 2.166666667

Calculate the square root of the right side: 1.471960145

Break this problem into two subproblems by setting 
(x + 1) equal to 1.471960145 and -1.471960145.

Subproblem 1

x + 1 = 1.471960145 Simplifying x + 1 = 1.471960145 Reorder the terms: 1 + x = 1.471960145 Solving 1 + x = 1.471960145 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.471960145 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.471960145 + -1 x = 1.471960145 + -1 Combine like terms: 1.471960145 + -1 = 0.471960145 x = 0.471960145 Simplifying x = 0.471960145

Subproblem 2

x + 1 = -1.471960145 Simplifying x + 1 = -1.471960145 Reorder the terms: 1 + x = -1.471960145 Solving 1 + x = -1.471960145 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.471960145 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.471960145 + -1 x = -1.471960145 + -1 Combine like terms: -1.471960145 + -1 = -2.471960145 x = -2.471960145 Simplifying x = -2.471960145

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.471960145, -2.471960145}

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