5x^2-8x-8-5x=0

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Solution for 5x^2-8x-8-5x=0 equation:


Simplifying
5x2 + -8x + -8 + -5x = 0

Reorder the terms:
-8 + -8x + -5x + 5x2 = 0

Combine like terms: -8x + -5x = -13x
-8 + -13x + 5x2 = 0

Solving
-8 + -13x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-1.6 + -2.6x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -2.6x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -2.6x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -2.6x + x2 = 0 + 1.6
-2.6x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-2.6x + x2 = 1.6

The x term is -2.6x.  Take half its coefficient (-1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
-2.6x + 1.69 + x2 = 1.6 + 1.69

Reorder the terms:
1.69 + -2.6x + x2 = 1.6 + 1.69

Combine like terms: 1.6 + 1.69 = 3.29
1.69 + -2.6x + x2 = 3.29

Factor a perfect square on the left side:
(x + -1.3)(x + -1.3) = 3.29

Calculate the square root of the right side: 1.813835715

Break this problem into two subproblems by setting 
(x + -1.3) equal to 1.813835715 and -1.813835715.

Subproblem 1

x + -1.3 = 1.813835715 Simplifying x + -1.3 = 1.813835715 Reorder the terms: -1.3 + x = 1.813835715 Solving -1.3 + x = 1.813835715 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + x = 1.813835715 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + x = 1.813835715 + 1.3 x = 1.813835715 + 1.3 Combine like terms: 1.813835715 + 1.3 = 3.113835715 x = 3.113835715 Simplifying x = 3.113835715

Subproblem 2

x + -1.3 = -1.813835715 Simplifying x + -1.3 = -1.813835715 Reorder the terms: -1.3 + x = -1.813835715 Solving -1.3 + x = -1.813835715 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + x = -1.813835715 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + x = -1.813835715 + 1.3 x = -1.813835715 + 1.3 Combine like terms: -1.813835715 + 1.3 = -0.513835715 x = -0.513835715 Simplifying x = -0.513835715

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.113835715, -0.513835715}

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