2X^2+31X-6.1=0

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Solution for 2X^2+31X-6.1=0 equation:


Simplifying
2X2 + 31X + -6.1 = 0

Reorder the terms:
-6.1 + 31X + 2X2 = 0

Solving
-6.1 + 31X + 2X2 = 0

Solving for variable 'X'.

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

Divide each side by '2'.
-3.05 + 15.5X + X2 = 0

Move the constant term to the right:

Add '3.05' to each side of the equation.
-3.05 + 15.5X + 3.05 + X2 = 0 + 3.05

Reorder the terms:
-3.05 + 3.05 + 15.5X + X2 = 0 + 3.05

Combine like terms: -3.05 + 3.05 = 0.00
0.00 + 15.5X + X2 = 0 + 3.05
15.5X + X2 = 0 + 3.05

Combine like terms: 0 + 3.05 = 3.05
15.5X + X2 = 3.05

The X term is 15.5X.  Take half its coefficient (7.75).
Square it (60.0625) and add it to both sides.

Add '60.0625' to each side of the equation.
15.5X + 60.0625 + X2 = 3.05 + 60.0625

Reorder the terms:
60.0625 + 15.5X + X2 = 3.05 + 60.0625

Combine like terms: 3.05 + 60.0625 = 63.1125
60.0625 + 15.5X + X2 = 63.1125

Factor a perfect square on the left side:
(X + 7.75)(X + 7.75) = 63.1125

Calculate the square root of the right side: 7.944337606

Break this problem into two subproblems by setting 
(X + 7.75) equal to 7.944337606 and -7.944337606.

Subproblem 1

X + 7.75 = 7.944337606 Simplifying X + 7.75 = 7.944337606 Reorder the terms: 7.75 + X = 7.944337606 Solving 7.75 + X = 7.944337606 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-7.75' to each side of the equation. 7.75 + -7.75 + X = 7.944337606 + -7.75 Combine like terms: 7.75 + -7.75 = 0.00 0.00 + X = 7.944337606 + -7.75 X = 7.944337606 + -7.75 Combine like terms: 7.944337606 + -7.75 = 0.194337606 X = 0.194337606 Simplifying X = 0.194337606

Subproblem 2

X + 7.75 = -7.944337606 Simplifying X + 7.75 = -7.944337606 Reorder the terms: 7.75 + X = -7.944337606 Solving 7.75 + X = -7.944337606 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-7.75' to each side of the equation. 7.75 + -7.75 + X = -7.944337606 + -7.75 Combine like terms: 7.75 + -7.75 = 0.00 0.00 + X = -7.944337606 + -7.75 X = -7.944337606 + -7.75 Combine like terms: -7.944337606 + -7.75 = -15.694337606 X = -15.694337606 Simplifying X = -15.694337606

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.194337606, -15.694337606}

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