64=x(.5x+4)

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Solution for 64=x(.5x+4) equation:


Simplifying
64 = x(0.5x + 4)

Reorder the terms:
64 = x(4 + 0.5x)
64 = (4 * x + 0.5x * x)
64 = (4x + 0.5x2)

Solving
64 = 4x + 0.5x2

Solving for variable 'x'.

Reorder the terms:
64 + -4x + -0.5x2 = 4x + -4x + 0.5x2 + -0.5x2

Combine like terms: 4x + -4x = 0
64 + -4x + -0.5x2 = 0 + 0.5x2 + -0.5x2
64 + -4x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
64 + -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'.
-128 + 8x + x2 = 0

Move the constant term to the right:

Add '128' to each side of the equation.
-128 + 8x + 128 + x2 = 0 + 128

Reorder the terms:
-128 + 128 + 8x + x2 = 0 + 128

Combine like terms: -128 + 128 = 0
0 + 8x + x2 = 0 + 128
8x + x2 = 0 + 128

Combine like terms: 0 + 128 = 128
8x + x2 = 128

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 = 128 + 16

Reorder the terms:
16 + 8x + x2 = 128 + 16

Combine like terms: 128 + 16 = 144
16 + 8x + x2 = 144

Factor a perfect square on the left side:
(x + 4)(x + 4) = 144

Calculate the square root of the right side: 12

Break this problem into two subproblems by setting 
(x + 4) equal to 12 and -12.

Subproblem 1

x + 4 = 12 Simplifying x + 4 = 12 Reorder the terms: 4 + x = 12 Solving 4 + x = 12 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 = 12 + -4 Combine like terms: 4 + -4 = 0 0 + x = 12 + -4 x = 12 + -4 Combine like terms: 12 + -4 = 8 x = 8 Simplifying x = 8

Subproblem 2

x + 4 = -12 Simplifying x + 4 = -12 Reorder the terms: 4 + x = -12 Solving 4 + x = -12 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 = -12 + -4 Combine like terms: 4 + -4 = 0 0 + x = -12 + -4 x = -12 + -4 Combine like terms: -12 + -4 = -16 x = -16 Simplifying x = -16

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, -16}

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