12x^2+13x=7

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Solution for 12x^2+13x=7 equation:


Simplifying
12x2 + 13x = 7

Reorder the terms:
13x + 12x2 = 7

Solving
13x + 12x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + 13x + 12x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 13x + 12x2 = 0

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

Divide each side by '12'.
-0.5833333333 + 1.083333333x + x2 = 0

Move the constant term to the right:

Add '0.5833333333' to each side of the equation.
-0.5833333333 + 1.083333333x + 0.5833333333 + x2 = 0 + 0.5833333333

Reorder the terms:
-0.5833333333 + 0.5833333333 + 1.083333333x + x2 = 0 + 0.5833333333

Combine like terms: -0.5833333333 + 0.5833333333 = 0.0000000000
0.0000000000 + 1.083333333x + x2 = 0 + 0.5833333333
1.083333333x + x2 = 0 + 0.5833333333

Combine like terms: 0 + 0.5833333333 = 0.5833333333
1.083333333x + x2 = 0.5833333333

The x term is 1.083333333x.  Take half its coefficient (0.5416666665).
Square it (0.2934027776) and add it to both sides.

Add '0.2934027776' to each side of the equation.
1.083333333x + 0.2934027776 + x2 = 0.5833333333 + 0.2934027776

Reorder the terms:
0.2934027776 + 1.083333333x + x2 = 0.5833333333 + 0.2934027776

Combine like terms: 0.5833333333 + 0.2934027776 = 0.8767361109
0.2934027776 + 1.083333333x + x2 = 0.8767361109

Factor a perfect square on the left side:
(x + 0.5416666665)(x + 0.5416666665) = 0.8767361109

Calculate the square root of the right side: 0.936341877

Break this problem into two subproblems by setting 
(x + 0.5416666665) equal to 0.936341877 and -0.936341877.

Subproblem 1

x + 0.5416666665 = 0.936341877 Simplifying x + 0.5416666665 = 0.936341877 Reorder the terms: 0.5416666665 + x = 0.936341877 Solving 0.5416666665 + x = 0.936341877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5416666665' to each side of the equation. 0.5416666665 + -0.5416666665 + x = 0.936341877 + -0.5416666665 Combine like terms: 0.5416666665 + -0.5416666665 = 0.0000000000 0.0000000000 + x = 0.936341877 + -0.5416666665 x = 0.936341877 + -0.5416666665 Combine like terms: 0.936341877 + -0.5416666665 = 0.3946752105 x = 0.3946752105 Simplifying x = 0.3946752105

Subproblem 2

x + 0.5416666665 = -0.936341877 Simplifying x + 0.5416666665 = -0.936341877 Reorder the terms: 0.5416666665 + x = -0.936341877 Solving 0.5416666665 + x = -0.936341877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5416666665' to each side of the equation. 0.5416666665 + -0.5416666665 + x = -0.936341877 + -0.5416666665 Combine like terms: 0.5416666665 + -0.5416666665 = 0.0000000000 0.0000000000 + x = -0.936341877 + -0.5416666665 x = -0.936341877 + -0.5416666665 Combine like terms: -0.936341877 + -0.5416666665 = -1.4780085435 x = -1.4780085435 Simplifying x = -1.4780085435

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3946752105, -1.4780085435}

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