-0.5x^2-10x+12=0

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Solution for -0.5x^2-10x+12=0 equation:


Simplifying
-0.5x2 + -10x + 12 = 0

Reorder the terms:
12 + -10x + -0.5x2 = 0

Solving
12 + -10x + -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'.
-24 + 20x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 20x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 20x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 20x + x2 = 0 + 24
20x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
20x + x2 = 24

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 24 + 100

Reorder the terms:
100 + 20x + x2 = 24 + 100

Combine like terms: 24 + 100 = 124
100 + 20x + x2 = 124

Factor a perfect square on the left side:
(x + 10)(x + 10) = 124

Calculate the square root of the right side: 11.135528726

Break this problem into two subproblems by setting 
(x + 10) equal to 11.135528726 and -11.135528726.

Subproblem 1

x + 10 = 11.135528726 Simplifying x + 10 = 11.135528726 Reorder the terms: 10 + x = 11.135528726 Solving 10 + x = 11.135528726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 11.135528726 + -10 Combine like terms: 10 + -10 = 0 0 + x = 11.135528726 + -10 x = 11.135528726 + -10 Combine like terms: 11.135528726 + -10 = 1.135528726 x = 1.135528726 Simplifying x = 1.135528726

Subproblem 2

x + 10 = -11.135528726 Simplifying x + 10 = -11.135528726 Reorder the terms: 10 + x = -11.135528726 Solving 10 + x = -11.135528726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -11.135528726 + -10 Combine like terms: 10 + -10 = 0 0 + x = -11.135528726 + -10 x = -11.135528726 + -10 Combine like terms: -11.135528726 + -10 = -21.135528726 x = -21.135528726 Simplifying x = -21.135528726

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.135528726, -21.135528726}

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