50=0.5x(x-8)

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Solution for 50=0.5x(x-8) equation:


Simplifying
50 = 0.5x(x + -8)

Reorder the terms:
50 = 0.5x(-8 + x)
50 = (-8 * 0.5x + x * 0.5x)
50 = (-4x + 0.5x2)

Solving
50 = -4x + 0.5x2

Solving for variable 'x'.

Reorder the terms:
50 + 4x + -0.5x2 = -4x + 4x + 0.5x2 + -0.5x2

Combine like terms: -4x + 4x = 0
50 + 4x + -0.5x2 = 0 + 0.5x2 + -0.5x2
50 + 4x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
50 + 4x + -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'.
-100 + -8x + x2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -8x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + -8x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -8x + x2 = 0 + 100
-8x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
-8x + x2 = 100

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 100 + 16

Reorder the terms:
16 + -8x + x2 = 100 + 16

Combine like terms: 100 + 16 = 116
16 + -8x + x2 = 116

Factor a perfect square on the left side:
(x + -4)(x + -4) = 116

Calculate the square root of the right side: 10.770329614

Break this problem into two subproblems by setting 
(x + -4) equal to 10.770329614 and -10.770329614.

Subproblem 1

x + -4 = 10.770329614 Simplifying x + -4 = 10.770329614 Reorder the terms: -4 + x = 10.770329614 Solving -4 + x = 10.770329614 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 10.770329614 + 4 Combine like terms: -4 + 4 = 0 0 + x = 10.770329614 + 4 x = 10.770329614 + 4 Combine like terms: 10.770329614 + 4 = 14.770329614 x = 14.770329614 Simplifying x = 14.770329614

Subproblem 2

x + -4 = -10.770329614 Simplifying x + -4 = -10.770329614 Reorder the terms: -4 + x = -10.770329614 Solving -4 + x = -10.770329614 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -10.770329614 + 4 Combine like terms: -4 + 4 = 0 0 + x = -10.770329614 + 4 x = -10.770329614 + 4 Combine like terms: -10.770329614 + 4 = -6.770329614 x = -6.770329614 Simplifying x = -6.770329614

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.770329614, -6.770329614}

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