306=(x-4)(x-4)(8.5)

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Solution for 306=(x-4)(x-4)(8.5) equation:


Simplifying
306 = (x + -4)(x + -4)(8.5)

Reorder the terms:
306 = (-4 + x)(x + -4)(8.5)

Reorder the terms:
306 = (-4 + x)(-4 + x)(8.5)

Reorder the terms for easier multiplication:
306 = 8.5(-4 + x)(-4 + x)

Multiply (-4 + x) * (-4 + x)
306 = 8.5(-4(-4 + x) + x(-4 + x))
306 = 8.5((-4 * -4 + x * -4) + x(-4 + x))
306 = 8.5((16 + -4x) + x(-4 + x))
306 = 8.5(16 + -4x + (-4 * x + x * x))
306 = 8.5(16 + -4x + (-4x + x2))

Combine like terms: -4x + -4x = -8x
306 = 8.5(16 + -8x + x2)
306 = (16 * 8.5 + -8x * 8.5 + x2 * 8.5)
306 = (136 + -68x + 8.5x2)

Solving
306 = 136 + -68x + 8.5x2

Solving for variable 'x'.

Combine like terms: 306 + -136 = 170
170 + 68x + -8.5x2 = 136 + -68x + 8.5x2 + -136 + 68x + -8.5x2

Reorder the terms:
170 + 68x + -8.5x2 = 136 + -136 + -68x + 68x + 8.5x2 + -8.5x2

Combine like terms: 136 + -136 = 0
170 + 68x + -8.5x2 = 0 + -68x + 68x + 8.5x2 + -8.5x2
170 + 68x + -8.5x2 = -68x + 68x + 8.5x2 + -8.5x2

Combine like terms: -68x + 68x = 0
170 + 68x + -8.5x2 = 0 + 8.5x2 + -8.5x2
170 + 68x + -8.5x2 = 8.5x2 + -8.5x2

Combine like terms: 8.5x2 + -8.5x2 = 0.0
170 + 68x + -8.5x2 = 0.0

Begin completing the square.  Divide all terms by
-8.5 the coefficient of the squared term: 

Divide each side by '-8.5'.
-20 + -8x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -8x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -8x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -8x + x2 = 0 + 20
-8x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-8x + x2 = 20

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 = 20 + 16

Reorder the terms:
16 + -8x + x2 = 20 + 16

Combine like terms: 20 + 16 = 36
16 + -8x + x2 = 36

Factor a perfect square on the left side:
(x + -4)(x + -4) = 36

Calculate the square root of the right side: 6

Break this problem into two subproblems by setting 
(x + -4) equal to 6 and -6.

Subproblem 1

x + -4 = 6 Simplifying x + -4 = 6 Reorder the terms: -4 + x = 6 Solving -4 + x = 6 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 = 6 + 4 Combine like terms: -4 + 4 = 0 0 + x = 6 + 4 x = 6 + 4 Combine like terms: 6 + 4 = 10 x = 10 Simplifying x = 10

Subproblem 2

x + -4 = -6 Simplifying x + -4 = -6 Reorder the terms: -4 + x = -6 Solving -4 + x = -6 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 = -6 + 4 Combine like terms: -4 + 4 = 0 0 + x = -6 + 4 x = -6 + 4 Combine like terms: -6 + 4 = -2 x = -2 Simplifying x = -2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10, -2}

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