10x^2-31x-12=0

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Solution for 10x^2-31x-12=0 equation:


Simplifying
10x2 + -31x + -12 = 0

Reorder the terms:
-12 + -31x + 10x2 = 0

Solving
-12 + -31x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-1.2 + -3.1x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + -3.1x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + -3.1x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + -3.1x + x2 = 0 + 1.2
-3.1x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
-3.1x + x2 = 1.2

The x term is -3.1x.  Take half its coefficient (-1.55).
Square it (2.4025) and add it to both sides.

Add '2.4025' to each side of the equation.
-3.1x + 2.4025 + x2 = 1.2 + 2.4025

Reorder the terms:
2.4025 + -3.1x + x2 = 1.2 + 2.4025

Combine like terms: 1.2 + 2.4025 = 3.6025
2.4025 + -3.1x + x2 = 3.6025

Factor a perfect square on the left side:
(x + -1.55)(x + -1.55) = 3.6025

Calculate the square root of the right side: 1.89802529

Break this problem into two subproblems by setting 
(x + -1.55) equal to 1.89802529 and -1.89802529.

Subproblem 1

x + -1.55 = 1.89802529 Simplifying x + -1.55 = 1.89802529 Reorder the terms: -1.55 + x = 1.89802529 Solving -1.55 + x = 1.89802529 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.55' to each side of the equation. -1.55 + 1.55 + x = 1.89802529 + 1.55 Combine like terms: -1.55 + 1.55 = 0.00 0.00 + x = 1.89802529 + 1.55 x = 1.89802529 + 1.55 Combine like terms: 1.89802529 + 1.55 = 3.44802529 x = 3.44802529 Simplifying x = 3.44802529

Subproblem 2

x + -1.55 = -1.89802529 Simplifying x + -1.55 = -1.89802529 Reorder the terms: -1.55 + x = -1.89802529 Solving -1.55 + x = -1.89802529 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.55' to each side of the equation. -1.55 + 1.55 + x = -1.89802529 + 1.55 Combine like terms: -1.55 + 1.55 = 0.00 0.00 + x = -1.89802529 + 1.55 x = -1.89802529 + 1.55 Combine like terms: -1.89802529 + 1.55 = -0.34802529 x = -0.34802529 Simplifying x = -0.34802529

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.44802529, -0.34802529}

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