2*x^2+13x=12

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


Simplifying
2x2 + 13x = 12

Reorder the terms:
13x + 2x2 = 12

Solving
13x + 2x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + 13x + 2x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + 13x + 2x2 = 0

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

Divide each side by '2'.
-6 + 6.5x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 6.5x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 6.5x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 6.5x + x2 = 0 + 6
6.5x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
6.5x + x2 = 6

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = 6 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = 6 + 10.5625

Combine like terms: 6 + 10.5625 = 16.5625
10.5625 + 6.5x + x2 = 16.5625

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 16.5625

Calculate the square root of the right side: 4.069705149

Break this problem into two subproblems by setting 
(x + 3.25) equal to 4.069705149 and -4.069705149.

Subproblem 1

x + 3.25 = 4.069705149 Simplifying x + 3.25 = 4.069705149 Reorder the terms: 3.25 + x = 4.069705149 Solving 3.25 + x = 4.069705149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 4.069705149 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 4.069705149 + -3.25 x = 4.069705149 + -3.25 Combine like terms: 4.069705149 + -3.25 = 0.819705149 x = 0.819705149 Simplifying x = 0.819705149

Subproblem 2

x + 3.25 = -4.069705149 Simplifying x + 3.25 = -4.069705149 Reorder the terms: 3.25 + x = -4.069705149 Solving 3.25 + x = -4.069705149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -4.069705149 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -4.069705149 + -3.25 x = -4.069705149 + -3.25 Combine like terms: -4.069705149 + -3.25 = -7.319705149 x = -7.319705149 Simplifying x = -7.319705149

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.819705149, -7.319705149}

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