20x^2+31x-12=0

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Solution for 20x^2+31x-12=0 equation:


Simplifying
20x2 + 31x + -12 = 0

Reorder the terms:
-12 + 31x + 20x2 = 0

Solving
-12 + 31x + 20x2 = 0

Solving for variable 'x'.

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

Divide each side by '20'.
-0.6 + 1.55x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + 1.55x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + 1.55x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 1.55x + x2 = 0 + 0.6
1.55x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
1.55x + x2 = 0.6

The x term is 1.55x.  Take half its coefficient (0.775).
Square it (0.600625) and add it to both sides.

Add '0.600625' to each side of the equation.
1.55x + 0.600625 + x2 = 0.6 + 0.600625

Reorder the terms:
0.600625 + 1.55x + x2 = 0.6 + 0.600625

Combine like terms: 0.6 + 0.600625 = 1.200625
0.600625 + 1.55x + x2 = 1.200625

Factor a perfect square on the left side:
(x + 0.775)(x + 0.775) = 1.200625

Calculate the square root of the right side: 1.09573035

Break this problem into two subproblems by setting 
(x + 0.775) equal to 1.09573035 and -1.09573035.

Subproblem 1

x + 0.775 = 1.09573035 Simplifying x + 0.775 = 1.09573035 Reorder the terms: 0.775 + x = 1.09573035 Solving 0.775 + x = 1.09573035 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.775' to each side of the equation. 0.775 + -0.775 + x = 1.09573035 + -0.775 Combine like terms: 0.775 + -0.775 = 0.000 0.000 + x = 1.09573035 + -0.775 x = 1.09573035 + -0.775 Combine like terms: 1.09573035 + -0.775 = 0.32073035 x = 0.32073035 Simplifying x = 0.32073035

Subproblem 2

x + 0.775 = -1.09573035 Simplifying x + 0.775 = -1.09573035 Reorder the terms: 0.775 + x = -1.09573035 Solving 0.775 + x = -1.09573035 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.775' to each side of the equation. 0.775 + -0.775 + x = -1.09573035 + -0.775 Combine like terms: 0.775 + -0.775 = 0.000 0.000 + x = -1.09573035 + -0.775 x = -1.09573035 + -0.775 Combine like terms: -1.09573035 + -0.775 = -1.87073035 x = -1.87073035 Simplifying x = -1.87073035

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.32073035, -1.87073035}

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