9.5*(x+4)(x-8)=0

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Solution for 9.5*(x+4)(x-8)=0 equation:


Simplifying
9.5(x + 4)(x + -8) = 0

Reorder the terms:
9.5(4 + x)(x + -8) = 0

Reorder the terms:
9.5(4 + x)(-8 + x) = 0

Multiply (4 + x) * (-8 + x)
9.5(4(-8 + x) + x(-8 + x)) = 0
9.5((-8 * 4 + x * 4) + x(-8 + x)) = 0
9.5((-32 + 4x) + x(-8 + x)) = 0
9.5(-32 + 4x + (-8 * x + x * x)) = 0
9.5(-32 + 4x + (-8x + x2)) = 0

Combine like terms: 4x + -8x = -4x
9.5(-32 + -4x + x2) = 0
(-32 * 9.5 + -4x * 9.5 + x2 * 9.5) = 0
(-304 + -38x + 9.5x2) = 0

Solving
-304 + -38x + 9.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '9.5'.
-32 + -4x + x2 = 0

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + -4x + 32 + x2 = 0 + 32

Reorder the terms:
-32 + 32 + -4x + x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + -4x + x2 = 0 + 32
-4x + x2 = 0 + 32

Combine like terms: 0 + 32 = 32
-4x + x2 = 32

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 = 32 + 4

Reorder the terms:
4 + -4x + x2 = 32 + 4

Combine like terms: 32 + 4 = 36
4 + -4x + x2 = 36

Factor a perfect square on the left side:
(x + -2)(x + -2) = 36

Calculate the square root of the right side: 6

Break this problem into two subproblems by setting 
(x + -2) equal to 6 and -6.

Subproblem 1

x + -2 = 6 Simplifying x + -2 = 6 Reorder the terms: -2 + x = 6 Solving -2 + x = 6 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 = 6 + 2 Combine like terms: -2 + 2 = 0 0 + x = 6 + 2 x = 6 + 2 Combine like terms: 6 + 2 = 8 x = 8 Simplifying x = 8

Subproblem 2

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

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, -4}

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