2x^2+31x-73=0

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Solution for 2x^2+31x-73=0 equation:


Simplifying
2x2 + 31x + -73 = 0

Reorder the terms:
-73 + 31x + 2x2 = 0

Solving
-73 + 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'.
-36.5 + 15.5x + x2 = 0

Move the constant term to the right:

Add '36.5' to each side of the equation.
-36.5 + 15.5x + 36.5 + x2 = 0 + 36.5

Reorder the terms:
-36.5 + 36.5 + 15.5x + x2 = 0 + 36.5

Combine like terms: -36.5 + 36.5 = 0.0
0.0 + 15.5x + x2 = 0 + 36.5
15.5x + x2 = 0 + 36.5

Combine like terms: 0 + 36.5 = 36.5
15.5x + x2 = 36.5

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 = 36.5 + 60.0625

Reorder the terms:
60.0625 + 15.5x + x2 = 36.5 + 60.0625

Combine like terms: 36.5 + 60.0625 = 96.5625
60.0625 + 15.5x + x2 = 96.5625

Factor a perfect square on the left side:
(x + 7.75)(x + 7.75) = 96.5625

Calculate the square root of the right side: 9.826622004

Break this problem into two subproblems by setting 
(x + 7.75) equal to 9.826622004 and -9.826622004.

Subproblem 1

x + 7.75 = 9.826622004 Simplifying x + 7.75 = 9.826622004 Reorder the terms: 7.75 + x = 9.826622004 Solving 7.75 + x = 9.826622004 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 = 9.826622004 + -7.75 Combine like terms: 7.75 + -7.75 = 0.00 0.00 + x = 9.826622004 + -7.75 x = 9.826622004 + -7.75 Combine like terms: 9.826622004 + -7.75 = 2.076622004 x = 2.076622004 Simplifying x = 2.076622004

Subproblem 2

x + 7.75 = -9.826622004 Simplifying x + 7.75 = -9.826622004 Reorder the terms: 7.75 + x = -9.826622004 Solving 7.75 + x = -9.826622004 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 = -9.826622004 + -7.75 Combine like terms: 7.75 + -7.75 = 0.00 0.00 + x = -9.826622004 + -7.75 x = -9.826622004 + -7.75 Combine like terms: -9.826622004 + -7.75 = -17.576622004 x = -17.576622004 Simplifying x = -17.576622004

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.076622004, -17.576622004}

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