6(x+3+6)=x(4x+x)

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Solution for 6(x+3+6)=x(4x+x) equation:


Simplifying
6(x + 3 + 6) = x(4x + x)

Reorder the terms:
6(3 + 6 + x) = x(4x + x)

Combine like terms: 3 + 6 = 9
6(9 + x) = x(4x + x)
(9 * 6 + x * 6) = x(4x + x)
(54 + 6x) = x(4x + x)

Combine like terms: 4x + x = 5x
54 + 6x = x(5x)

Remove parenthesis around (5x)
54 + 6x = x * 5x

Reorder the terms for easier multiplication:
54 + 6x = 5x * x

Multiply x * x
54 + 6x = 5x2

Solving
54 + 6x = 5x2

Solving for variable 'x'.

Combine like terms: 5x2 + -5x2 = 0
54 + 6x + -5x2 = 0

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

Divide each side by '-5'.
-10.8 + -1.2x + x2 = 0

Move the constant term to the right:

Add '10.8' to each side of the equation.
-10.8 + -1.2x + 10.8 + x2 = 0 + 10.8

Reorder the terms:
-10.8 + 10.8 + -1.2x + x2 = 0 + 10.8

Combine like terms: -10.8 + 10.8 = 0.0
0.0 + -1.2x + x2 = 0 + 10.8
-1.2x + x2 = 0 + 10.8

Combine like terms: 0 + 10.8 = 10.8
-1.2x + x2 = 10.8

The x term is -1.2x.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2x + 0.36 + x2 = 10.8 + 0.36

Reorder the terms:
0.36 + -1.2x + x2 = 10.8 + 0.36

Combine like terms: 10.8 + 0.36 = 11.16
0.36 + -1.2x + x2 = 11.16

Factor a perfect square on the left side:
(x + -0.6)(x + -0.6) = 11.16

Calculate the square root of the right side: 3.340658618

Break this problem into two subproblems by setting 
(x + -0.6) equal to 3.340658618 and -3.340658618.

Subproblem 1

x + -0.6 = 3.340658618 Simplifying x + -0.6 = 3.340658618 Reorder the terms: -0.6 + x = 3.340658618 Solving -0.6 + x = 3.340658618 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = 3.340658618 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = 3.340658618 + 0.6 x = 3.340658618 + 0.6 Combine like terms: 3.340658618 + 0.6 = 3.940658618 x = 3.940658618 Simplifying x = 3.940658618

Subproblem 2

x + -0.6 = -3.340658618 Simplifying x + -0.6 = -3.340658618 Reorder the terms: -0.6 + x = -3.340658618 Solving -0.6 + x = -3.340658618 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = -3.340658618 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = -3.340658618 + 0.6 x = -3.340658618 + 0.6 Combine like terms: -3.340658618 + 0.6 = -2.740658618 x = -2.740658618 Simplifying x = -2.740658618

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.940658618, -2.740658618}

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