36x^2+31x-15=0

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Solution for 36x^2+31x-15=0 equation:


Simplifying
36x2 + 31x + -15 = 0

Reorder the terms:
-15 + 31x + 36x2 = 0

Solving
-15 + 31x + 36x2 = 0

Solving for variable 'x'.

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

Divide each side by '36'.
-0.4166666667 + 0.8611111111x + x2 = 0

Move the constant term to the right:

Add '0.4166666667' to each side of the equation.
-0.4166666667 + 0.8611111111x + 0.4166666667 + x2 = 0 + 0.4166666667

Reorder the terms:
-0.4166666667 + 0.4166666667 + 0.8611111111x + x2 = 0 + 0.4166666667

Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000
0.0000000000 + 0.8611111111x + x2 = 0 + 0.4166666667
0.8611111111x + x2 = 0 + 0.4166666667

Combine like terms: 0 + 0.4166666667 = 0.4166666667
0.8611111111x + x2 = 0.4166666667

The x term is 0.8611111111x.  Take half its coefficient (0.4305555556).
Square it (0.1853780865) and add it to both sides.

Add '0.1853780865' to each side of the equation.
0.8611111111x + 0.1853780865 + x2 = 0.4166666667 + 0.1853780865

Reorder the terms:
0.1853780865 + 0.8611111111x + x2 = 0.4166666667 + 0.1853780865

Combine like terms: 0.4166666667 + 0.1853780865 = 0.6020447532
0.1853780865 + 0.8611111111x + x2 = 0.6020447532

Factor a perfect square on the left side:
(x + 0.4305555556)(x + 0.4305555556) = 0.6020447532

Calculate the square root of the right side: 0.775915429

Break this problem into two subproblems by setting 
(x + 0.4305555556) equal to 0.775915429 and -0.775915429.

Subproblem 1

x + 0.4305555556 = 0.775915429 Simplifying x + 0.4305555556 = 0.775915429 Reorder the terms: 0.4305555556 + x = 0.775915429 Solving 0.4305555556 + x = 0.775915429 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4305555556' to each side of the equation. 0.4305555556 + -0.4305555556 + x = 0.775915429 + -0.4305555556 Combine like terms: 0.4305555556 + -0.4305555556 = 0.0000000000 0.0000000000 + x = 0.775915429 + -0.4305555556 x = 0.775915429 + -0.4305555556 Combine like terms: 0.775915429 + -0.4305555556 = 0.3453598734 x = 0.3453598734 Simplifying x = 0.3453598734

Subproblem 2

x + 0.4305555556 = -0.775915429 Simplifying x + 0.4305555556 = -0.775915429 Reorder the terms: 0.4305555556 + x = -0.775915429 Solving 0.4305555556 + x = -0.775915429 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4305555556' to each side of the equation. 0.4305555556 + -0.4305555556 + x = -0.775915429 + -0.4305555556 Combine like terms: 0.4305555556 + -0.4305555556 = 0.0000000000 0.0000000000 + x = -0.775915429 + -0.4305555556 x = -0.775915429 + -0.4305555556 Combine like terms: -0.775915429 + -0.4305555556 = -1.2064709846 x = -1.2064709846 Simplifying x = -1.2064709846

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3453598734, -1.2064709846}

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