36x^2+12x=13

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Solution for 36x^2+12x=13 equation:


Simplifying
36x2 + 12x = 13

Reorder the terms:
12x + 36x2 = 13

Solving
12x + 36x2 = 13

Solving for variable 'x'.

Reorder the terms:
-13 + 12x + 36x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + 12x + 36x2 = 0

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

Divide each side by '36'.
-0.3611111111 + 0.3333333333x + x2 = 0

Move the constant term to the right:

Add '0.3611111111' to each side of the equation.
-0.3611111111 + 0.3333333333x + 0.3611111111 + x2 = 0 + 0.3611111111

Reorder the terms:
-0.3611111111 + 0.3611111111 + 0.3333333333x + x2 = 0 + 0.3611111111

Combine like terms: -0.3611111111 + 0.3611111111 = 0.0000000000
0.0000000000 + 0.3333333333x + x2 = 0 + 0.3611111111
0.3333333333x + x2 = 0 + 0.3611111111

Combine like terms: 0 + 0.3611111111 = 0.3611111111
0.3333333333x + x2 = 0.3611111111

The x term is 0.3333333333x.  Take half its coefficient (0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
0.3333333333x + 0.02777777779 + x2 = 0.3611111111 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333x + x2 = 0.3611111111 + 0.02777777779

Combine like terms: 0.3611111111 + 0.02777777779 = 0.38888888889
0.02777777779 + 0.3333333333x + x2 = 0.38888888889

Factor a perfect square on the left side:
(x + 0.1666666667)(x + 0.1666666667) = 0.38888888889

Calculate the square root of the right side: 0.623609564

Break this problem into two subproblems by setting 
(x + 0.1666666667) equal to 0.623609564 and -0.623609564.

Subproblem 1

x + 0.1666666667 = 0.623609564 Simplifying x + 0.1666666667 = 0.623609564 Reorder the terms: 0.1666666667 + x = 0.623609564 Solving 0.1666666667 + x = 0.623609564 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + x = 0.623609564 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = 0.623609564 + -0.1666666667 x = 0.623609564 + -0.1666666667 Combine like terms: 0.623609564 + -0.1666666667 = 0.4569428973 x = 0.4569428973 Simplifying x = 0.4569428973

Subproblem 2

x + 0.1666666667 = -0.623609564 Simplifying x + 0.1666666667 = -0.623609564 Reorder the terms: 0.1666666667 + x = -0.623609564 Solving 0.1666666667 + x = -0.623609564 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + x = -0.623609564 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = -0.623609564 + -0.1666666667 x = -0.623609564 + -0.1666666667 Combine like terms: -0.623609564 + -0.1666666667 = -0.7902762307 x = -0.7902762307 Simplifying x = -0.7902762307

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4569428973, -0.7902762307}

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