96=0.5*(x+4)*x

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Solution for 96=0.5*(x+4)*x equation:


Simplifying
96 = 0.5(x + 4) * x

Reorder the terms:
96 = 0.5(4 + x) * x

Reorder the terms for easier multiplication:
96 = 0.5x(4 + x)
96 = (4 * 0.5x + x * 0.5x)
96 = (2x + 0.5x2)

Solving
96 = 2x + 0.5x2

Solving for variable 'x'.

Reorder the terms:
96 + -2x + -0.5x2 = 2x + -2x + 0.5x2 + -0.5x2

Combine like terms: 2x + -2x = 0
96 + -2x + -0.5x2 = 0 + 0.5x2 + -0.5x2
96 + -2x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
96 + -2x + -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'.
-192 + 4x + x2 = 0

Move the constant term to the right:

Add '192' to each side of the equation.
-192 + 4x + 192 + x2 = 0 + 192

Reorder the terms:
-192 + 192 + 4x + x2 = 0 + 192

Combine like terms: -192 + 192 = 0
0 + 4x + x2 = 0 + 192
4x + x2 = 0 + 192

Combine like terms: 0 + 192 = 192
4x + x2 = 192

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 192 + 4

Reorder the terms:
4 + 4x + x2 = 192 + 4

Combine like terms: 192 + 4 = 196
4 + 4x + x2 = 196

Factor a perfect square on the left side:
(x + 2)(x + 2) = 196

Calculate the square root of the right side: 14

Break this problem into two subproblems by setting 
(x + 2) equal to 14 and -14.

Subproblem 1

x + 2 = 14 Simplifying x + 2 = 14 Reorder the terms: 2 + x = 14 Solving 2 + x = 14 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 14 + -2 Combine like terms: 2 + -2 = 0 0 + x = 14 + -2 x = 14 + -2 Combine like terms: 14 + -2 = 12 x = 12 Simplifying x = 12

Subproblem 2

x + 2 = -14 Simplifying x + 2 = -14 Reorder the terms: 2 + x = -14 Solving 2 + x = -14 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -14 + -2 Combine like terms: 2 + -2 = 0 0 + x = -14 + -2 x = -14 + -2 Combine like terms: -14 + -2 = -16 x = -16 Simplifying x = -16

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12, -16}

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