5(x-3)(x+8)=8

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Solution for 5(x-3)(x+8)=8 equation:


Simplifying
5(x + -3)(x + 8) = 8

Reorder the terms:
5(-3 + x)(x + 8) = 8

Reorder the terms:
5(-3 + x)(8 + x) = 8

Multiply (-3 + x) * (8 + x)
5(-3(8 + x) + x(8 + x)) = 8
5((8 * -3 + x * -3) + x(8 + x)) = 8
5((-24 + -3x) + x(8 + x)) = 8
5(-24 + -3x + (8 * x + x * x)) = 8
5(-24 + -3x + (8x + x2)) = 8

Combine like terms: -3x + 8x = 5x
5(-24 + 5x + x2) = 8
(-24 * 5 + 5x * 5 + x2 * 5) = 8
(-120 + 25x + 5x2) = 8

Solving
-120 + 25x + 5x2 = 8

Solving for variable 'x'.

Reorder the terms:
-120 + -8 + 25x + 5x2 = 8 + -8

Combine like terms: -120 + -8 = -128
-128 + 25x + 5x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-128 + 25x + 5x2 = 0

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

Divide each side by '5'.
-25.6 + 5x + x2 = 0

Move the constant term to the right:

Add '25.6' to each side of the equation.
-25.6 + 5x + 25.6 + x2 = 0 + 25.6

Reorder the terms:
-25.6 + 25.6 + 5x + x2 = 0 + 25.6

Combine like terms: -25.6 + 25.6 = 0.0
0.0 + 5x + x2 = 0 + 25.6
5x + x2 = 0 + 25.6

Combine like terms: 0 + 25.6 = 25.6
5x + x2 = 25.6

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 25.6 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 25.6 + 6.25

Combine like terms: 25.6 + 6.25 = 31.85
6.25 + 5x + x2 = 31.85

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 31.85

Calculate the square root of the right side: 5.643580424

Break this problem into two subproblems by setting 
(x + 2.5) equal to 5.643580424 and -5.643580424.

Subproblem 1

x + 2.5 = 5.643580424 Simplifying x + 2.5 = 5.643580424 Reorder the terms: 2.5 + x = 5.643580424 Solving 2.5 + x = 5.643580424 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 5.643580424 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 5.643580424 + -2.5 x = 5.643580424 + -2.5 Combine like terms: 5.643580424 + -2.5 = 3.143580424 x = 3.143580424 Simplifying x = 3.143580424

Subproblem 2

x + 2.5 = -5.643580424 Simplifying x + 2.5 = -5.643580424 Reorder the terms: 2.5 + x = -5.643580424 Solving 2.5 + x = -5.643580424 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -5.643580424 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -5.643580424 + -2.5 x = -5.643580424 + -2.5 Combine like terms: -5.643580424 + -2.5 = -8.143580424 x = -8.143580424 Simplifying x = -8.143580424

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.143580424, -8.143580424}

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