0.25x^2+6.5x-117=0

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Solution for 0.25x^2+6.5x-117=0 equation:


Simplifying
0.25x2 + 6.5x + -117 = 0

Reorder the terms:
-117 + 6.5x + 0.25x2 = 0

Solving
-117 + 6.5x + 0.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.25'.
-468 + 26x + x2 = 0

Move the constant term to the right:

Add '468' to each side of the equation.
-468 + 26x + 468 + x2 = 0 + 468

Reorder the terms:
-468 + 468 + 26x + x2 = 0 + 468

Combine like terms: -468 + 468 = 0
0 + 26x + x2 = 0 + 468
26x + x2 = 0 + 468

Combine like terms: 0 + 468 = 468
26x + x2 = 468

The x term is 26x.  Take half its coefficient (13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
26x + 169 + x2 = 468 + 169

Reorder the terms:
169 + 26x + x2 = 468 + 169

Combine like terms: 468 + 169 = 637
169 + 26x + x2 = 637

Factor a perfect square on the left side:
(x + 13)(x + 13) = 637

Calculate the square root of the right side: 25.238858928

Break this problem into two subproblems by setting 
(x + 13) equal to 25.238858928 and -25.238858928.

Subproblem 1

x + 13 = 25.238858928 Simplifying x + 13 = 25.238858928 Reorder the terms: 13 + x = 25.238858928 Solving 13 + x = 25.238858928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + x = 25.238858928 + -13 Combine like terms: 13 + -13 = 0 0 + x = 25.238858928 + -13 x = 25.238858928 + -13 Combine like terms: 25.238858928 + -13 = 12.238858928 x = 12.238858928 Simplifying x = 12.238858928

Subproblem 2

x + 13 = -25.238858928 Simplifying x + 13 = -25.238858928 Reorder the terms: 13 + x = -25.238858928 Solving 13 + x = -25.238858928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + x = -25.238858928 + -13 Combine like terms: 13 + -13 = 0 0 + x = -25.238858928 + -13 x = -25.238858928 + -13 Combine like terms: -25.238858928 + -13 = -38.238858928 x = -38.238858928 Simplifying x = -38.238858928

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.238858928, -38.238858928}

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