x+8x-x(x-4)=(x-3)

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Solution for x+8x-x(x-4)=(x-3) equation:


Simplifying
x + 8x + -1x(x + -4) = (x + -3)

Reorder the terms:
x + 8x + -1x(-4 + x) = (x + -3)
x + 8x + (-4 * -1x + x * -1x) = (x + -3)
x + 8x + (4x + -1x2) = (x + -3)

Combine like terms: x + 8x = 9x
9x + 4x + -1x2 = (x + -3)

Combine like terms: 9x + 4x = 13x
13x + -1x2 = (x + -3)

Reorder the terms:
13x + -1x2 = (-3 + x)

Remove parenthesis around (-3 + x)
13x + -1x2 = -3 + x

Solving
13x + -1x2 = -3 + x

Solving for variable 'x'.

Reorder the terms:
3 + 13x + -1x + -1x2 = -3 + x + 3 + -1x

Combine like terms: 13x + -1x = 12x
3 + 12x + -1x2 = -3 + x + 3 + -1x

Reorder the terms:
3 + 12x + -1x2 = -3 + 3 + x + -1x

Combine like terms: -3 + 3 = 0
3 + 12x + -1x2 = 0 + x + -1x
3 + 12x + -1x2 = x + -1x

Combine like terms: x + -1x = 0
3 + 12x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-3 + -12x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -12x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -12x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -12x + x2 = 0 + 3
-12x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-12x + x2 = 3

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = 3 + 36

Reorder the terms:
36 + -12x + x2 = 3 + 36

Combine like terms: 3 + 36 = 39
36 + -12x + x2 = 39

Factor a perfect square on the left side:
(x + -6)(x + -6) = 39

Calculate the square root of the right side: 6.244997998

Break this problem into two subproblems by setting 
(x + -6) equal to 6.244997998 and -6.244997998.

Subproblem 1

x + -6 = 6.244997998 Simplifying x + -6 = 6.244997998 Reorder the terms: -6 + x = 6.244997998 Solving -6 + x = 6.244997998 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 6.244997998 + 6 Combine like terms: -6 + 6 = 0 0 + x = 6.244997998 + 6 x = 6.244997998 + 6 Combine like terms: 6.244997998 + 6 = 12.244997998 x = 12.244997998 Simplifying x = 12.244997998

Subproblem 2

x + -6 = -6.244997998 Simplifying x + -6 = -6.244997998 Reorder the terms: -6 + x = -6.244997998 Solving -6 + x = -6.244997998 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -6.244997998 + 6 Combine like terms: -6 + 6 = 0 0 + x = -6.244997998 + 6 x = -6.244997998 + 6 Combine like terms: -6.244997998 + 6 = -0.244997998 x = -0.244997998 Simplifying x = -0.244997998

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.244997998, -0.244997998}

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