-.5x^2+12.5x+1.9=0

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Solution for -.5x^2+12.5x+1.9=0 equation:


Simplifying
-0.5x2 + 12.5x + 1.9 = 0

Reorder the terms:
1.9 + 12.5x + -0.5x2 = 0

Solving
1.9 + 12.5x + -0.5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-3.8 + -25x + x2 = 0

Move the constant term to the right:

Add '3.8' to each side of the equation.
-3.8 + -25x + 3.8 + x2 = 0 + 3.8

Reorder the terms:
-3.8 + 3.8 + -25x + x2 = 0 + 3.8

Combine like terms: -3.8 + 3.8 = 0.0
0.0 + -25x + x2 = 0 + 3.8
-25x + x2 = 0 + 3.8

Combine like terms: 0 + 3.8 = 3.8
-25x + x2 = 3.8

The x term is -25x.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25x + 156.25 + x2 = 3.8 + 156.25

Reorder the terms:
156.25 + -25x + x2 = 3.8 + 156.25

Combine like terms: 3.8 + 156.25 = 160.05
156.25 + -25x + x2 = 160.05

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = 160.05

Calculate the square root of the right side: 12.65108691

Break this problem into two subproblems by setting 
(x + -12.5) equal to 12.65108691 and -12.65108691.

Subproblem 1

x + -12.5 = 12.65108691 Simplifying x + -12.5 = 12.65108691 Reorder the terms: -12.5 + x = 12.65108691 Solving -12.5 + x = 12.65108691 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + x = 12.65108691 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = 12.65108691 + 12.5 x = 12.65108691 + 12.5 Combine like terms: 12.65108691 + 12.5 = 25.15108691 x = 25.15108691 Simplifying x = 25.15108691

Subproblem 2

x + -12.5 = -12.65108691 Simplifying x + -12.5 = -12.65108691 Reorder the terms: -12.5 + x = -12.65108691 Solving -12.5 + x = -12.65108691 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + x = -12.65108691 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = -12.65108691 + 12.5 x = -12.65108691 + 12.5 Combine like terms: -12.65108691 + 12.5 = -0.15108691 x = -0.15108691 Simplifying x = -0.15108691

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.15108691, -0.15108691}

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