5x(x-4)+3x-9x=6-(2x+5)+8x

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Solution for 5x(x-4)+3x-9x=6-(2x+5)+8x equation:


Simplifying
5x(x + -4) + 3x + -9x = 6 + -1(2x + 5) + 8x

Reorder the terms:
5x(-4 + x) + 3x + -9x = 6 + -1(2x + 5) + 8x
(-4 * 5x + x * 5x) + 3x + -9x = 6 + -1(2x + 5) + 8x
(-20x + 5x2) + 3x + -9x = 6 + -1(2x + 5) + 8x

Reorder the terms:
-20x + 3x + -9x + 5x2 = 6 + -1(2x + 5) + 8x

Combine like terms: -20x + 3x = -17x
-17x + -9x + 5x2 = 6 + -1(2x + 5) + 8x

Combine like terms: -17x + -9x = -26x
-26x + 5x2 = 6 + -1(2x + 5) + 8x

Reorder the terms:
-26x + 5x2 = 6 + -1(5 + 2x) + 8x
-26x + 5x2 = 6 + (5 * -1 + 2x * -1) + 8x
-26x + 5x2 = 6 + (-5 + -2x) + 8x

Combine like terms: 6 + -5 = 1
-26x + 5x2 = 1 + -2x + 8x

Combine like terms: -2x + 8x = 6x
-26x + 5x2 = 1 + 6x

Solving
-26x + 5x2 = 1 + 6x

Solving for variable 'x'.

Reorder the terms:
-1 + -26x + -6x + 5x2 = 1 + 6x + -1 + -6x

Combine like terms: -26x + -6x = -32x
-1 + -32x + 5x2 = 1 + 6x + -1 + -6x

Reorder the terms:
-1 + -32x + 5x2 = 1 + -1 + 6x + -6x

Combine like terms: 1 + -1 = 0
-1 + -32x + 5x2 = 0 + 6x + -6x
-1 + -32x + 5x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-1 + -32x + 5x2 = 0

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

Divide each side by '5'.
-0.2 + -6.4x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -6.4x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -6.4x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -6.4x + x2 = 0 + 0.2
-6.4x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-6.4x + x2 = 0.2

The x term is -6.4x.  Take half its coefficient (-3.2).
Square it (10.24) and add it to both sides.

Add '10.24' to each side of the equation.
-6.4x + 10.24 + x2 = 0.2 + 10.24

Reorder the terms:
10.24 + -6.4x + x2 = 0.2 + 10.24

Combine like terms: 0.2 + 10.24 = 10.44
10.24 + -6.4x + x2 = 10.44

Factor a perfect square on the left side:
(x + -3.2)(x + -3.2) = 10.44

Calculate the square root of the right side: 3.231098884

Break this problem into two subproblems by setting 
(x + -3.2) equal to 3.231098884 and -3.231098884.

Subproblem 1

x + -3.2 = 3.231098884 Simplifying x + -3.2 = 3.231098884 Reorder the terms: -3.2 + x = 3.231098884 Solving -3.2 + x = 3.231098884 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = 3.231098884 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = 3.231098884 + 3.2 x = 3.231098884 + 3.2 Combine like terms: 3.231098884 + 3.2 = 6.431098884 x = 6.431098884 Simplifying x = 6.431098884

Subproblem 2

x + -3.2 = -3.231098884 Simplifying x + -3.2 = -3.231098884 Reorder the terms: -3.2 + x = -3.231098884 Solving -3.2 + x = -3.231098884 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = -3.231098884 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = -3.231098884 + 3.2 x = -3.231098884 + 3.2 Combine like terms: -3.231098884 + 3.2 = -0.031098884 x = -0.031098884 Simplifying x = -0.031098884

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.431098884, -0.031098884}

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