66=(x-4)(x-.5)

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Solution for 66=(x-4)(x-.5) equation:


Simplifying
66 = (x + -4)(x + -0.5)

Reorder the terms:
66 = (-4 + x)(x + -0.5)

Reorder the terms:
66 = (-4 + x)(-0.5 + x)

Multiply (-4 + x) * (-0.5 + x)
66 = (-4(-0.5 + x) + x(-0.5 + x))
66 = ((-0.5 * -4 + x * -4) + x(-0.5 + x))
66 = ((2 + -4x) + x(-0.5 + x))
66 = (2 + -4x + (-0.5 * x + x * x))
66 = (2 + -4x + (-0.5x + x2))

Combine like terms: -4x + -0.5x = -4.5x
66 = (2 + -4.5x + x2)

Solving
66 = 2 + -4.5x + x2

Solving for variable 'x'.

Combine like terms: 66 + -2 = 64
64 + 4.5x + -1x2 = 2 + -4.5x + x2 + -2 + 4.5x + -1x2

Reorder the terms:
64 + 4.5x + -1x2 = 2 + -2 + -4.5x + 4.5x + x2 + -1x2

Combine like terms: 2 + -2 = 0
64 + 4.5x + -1x2 = 0 + -4.5x + 4.5x + x2 + -1x2
64 + 4.5x + -1x2 = -4.5x + 4.5x + x2 + -1x2

Combine like terms: -4.5x + 4.5x = 0.0
64 + 4.5x + -1x2 = 0.0 + x2 + -1x2
64 + 4.5x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
64 + 4.5x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-64 + -4.5x + x2 = 0

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -4.5x + 64 + x2 = 0 + 64

Reorder the terms:
-64 + 64 + -4.5x + x2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -4.5x + x2 = 0 + 64
-4.5x + x2 = 0 + 64

Combine like terms: 0 + 64 = 64
-4.5x + x2 = 64

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 64 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 64 + 5.0625

Combine like terms: 64 + 5.0625 = 69.0625
5.0625 + -4.5x + x2 = 69.0625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 69.0625

Calculate the square root of the right side: 8.310385069

Break this problem into two subproblems by setting 
(x + -2.25) equal to 8.310385069 and -8.310385069.

Subproblem 1

x + -2.25 = 8.310385069 Simplifying x + -2.25 = 8.310385069 Reorder the terms: -2.25 + x = 8.310385069 Solving -2.25 + x = 8.310385069 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 8.310385069 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 8.310385069 + 2.25 x = 8.310385069 + 2.25 Combine like terms: 8.310385069 + 2.25 = 10.560385069 x = 10.560385069 Simplifying x = 10.560385069

Subproblem 2

x + -2.25 = -8.310385069 Simplifying x + -2.25 = -8.310385069 Reorder the terms: -2.25 + x = -8.310385069 Solving -2.25 + x = -8.310385069 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -8.310385069 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -8.310385069 + 2.25 x = -8.310385069 + 2.25 Combine like terms: -8.310385069 + 2.25 = -6.060385069 x = -6.060385069 Simplifying x = -6.060385069

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.560385069, -6.060385069}

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