12=.5(x)(x-5)

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Solution for 12=.5(x)(x-5) equation:


Simplifying
12 = 0.5(x)(x + -5)

Reorder the terms:
12 = 0.5x(-5 + x)
12 = (-5 * 0.5x + x * 0.5x)
12 = (-2.5x + 0.5x2)

Solving
12 = -2.5x + 0.5x2

Solving for variable 'x'.

Reorder the terms:
12 + 2.5x + -0.5x2 = -2.5x + 2.5x + 0.5x2 + -0.5x2

Combine like terms: -2.5x + 2.5x = 0.0
12 + 2.5x + -0.5x2 = 0.0 + 0.5x2 + -0.5x2
12 + 2.5x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
12 + 2.5x + -0.5x2 = 0.0

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

Divide each side by '-0.5'.
-24 + -5x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -5x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + -5x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -5x + x2 = 0 + 24
-5x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
-5x + x2 = 24

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 24 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 24 + 6.25

Combine like terms: 24 + 6.25 = 30.25
6.25 + -5x + x2 = 30.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 30.25

Calculate the square root of the right side: 5.5

Break this problem into two subproblems by setting 
(x + -2.5) equal to 5.5 and -5.5.

Subproblem 1

x + -2.5 = 5.5 Simplifying x + -2.5 = 5.5 Reorder the terms: -2.5 + x = 5.5 Solving -2.5 + x = 5.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 5.5 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 5.5 + 2.5 x = 5.5 + 2.5 Combine like terms: 5.5 + 2.5 = 8 x = 8 Simplifying x = 8

Subproblem 2

x + -2.5 = -5.5 Simplifying x + -2.5 = -5.5 Reorder the terms: -2.5 + x = -5.5 Solving -2.5 + x = -5.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -5.5 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -5.5 + 2.5 x = -5.5 + 2.5 Combine like terms: -5.5 + 2.5 = -3 x = -3 Simplifying x = -3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, -3}

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