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

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


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

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

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

Multiply (-5 + x) * (8 + 5x)
(-5(8 + 5x) + x(8 + 5x)) = 8
((8 * -5 + 5x * -5) + x(8 + 5x)) = 8
((-40 + -25x) + x(8 + 5x)) = 8
(-40 + -25x + (8 * x + 5x * x)) = 8
(-40 + -25x + (8x + 5x2)) = 8

Combine like terms: -25x + 8x = -17x
(-40 + -17x + 5x2) = 8

Solving
-40 + -17x + 5x2 = 8

Solving for variable 'x'.

Reorder the terms:
-40 + -8 + -17x + 5x2 = 8 + -8

Combine like terms: -40 + -8 = -48
-48 + -17x + 5x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-48 + -17x + 5x2 = 0

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

Divide each side by '5'.
-9.6 + -3.4x + x2 = 0

Move the constant term to the right:

Add '9.6' to each side of the equation.
-9.6 + -3.4x + 9.6 + x2 = 0 + 9.6

Reorder the terms:
-9.6 + 9.6 + -3.4x + x2 = 0 + 9.6

Combine like terms: -9.6 + 9.6 = 0.0
0.0 + -3.4x + x2 = 0 + 9.6
-3.4x + x2 = 0 + 9.6

Combine like terms: 0 + 9.6 = 9.6
-3.4x + x2 = 9.6

The x term is -3.4x.  Take half its coefficient (-1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
-3.4x + 2.89 + x2 = 9.6 + 2.89

Reorder the terms:
2.89 + -3.4x + x2 = 9.6 + 2.89

Combine like terms: 9.6 + 2.89 = 12.49
2.89 + -3.4x + x2 = 12.49

Factor a perfect square on the left side:
(x + -1.7)(x + -1.7) = 12.49

Calculate the square root of the right side: 3.534119409

Break this problem into two subproblems by setting 
(x + -1.7) equal to 3.534119409 and -3.534119409.

Subproblem 1

x + -1.7 = 3.534119409 Simplifying x + -1.7 = 3.534119409 Reorder the terms: -1.7 + x = 3.534119409 Solving -1.7 + x = 3.534119409 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = 3.534119409 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = 3.534119409 + 1.7 x = 3.534119409 + 1.7 Combine like terms: 3.534119409 + 1.7 = 5.234119409 x = 5.234119409 Simplifying x = 5.234119409

Subproblem 2

x + -1.7 = -3.534119409 Simplifying x + -1.7 = -3.534119409 Reorder the terms: -1.7 + x = -3.534119409 Solving -1.7 + x = -3.534119409 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = -3.534119409 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = -3.534119409 + 1.7 x = -3.534119409 + 1.7 Combine like terms: -3.534119409 + 1.7 = -1.834119409 x = -1.834119409 Simplifying x = -1.834119409

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.234119409, -1.834119409}

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