36=x(x+x-3)

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Solution for 36=x(x+x-3) equation:


Simplifying
36 = x(x + x + -3)

Reorder the terms:
36 = x(-3 + x + x)

Combine like terms: x + x = 2x
36 = x(-3 + 2x)
36 = (-3 * x + 2x * x)
36 = (-3x + 2x2)

Solving
36 = -3x + 2x2

Solving for variable 'x'.

Reorder the terms:
36 + 3x + -2x2 = -3x + 3x + 2x2 + -2x2

Combine like terms: -3x + 3x = 0
36 + 3x + -2x2 = 0 + 2x2 + -2x2
36 + 3x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
36 + 3x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-18 + -1.5x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -1.5x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + -1.5x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -1.5x + x2 = 0 + 18
-1.5x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-1.5x + x2 = 18

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 18 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 18 + 0.5625

Combine like terms: 18 + 0.5625 = 18.5625
0.5625 + -1.5x + x2 = 18.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 18.5625

Calculate the square root of the right side: 4.308421985

Break this problem into two subproblems by setting 
(x + -0.75) equal to 4.308421985 and -4.308421985.

Subproblem 1

x + -0.75 = 4.308421985 Simplifying x + -0.75 = 4.308421985 Reorder the terms: -0.75 + x = 4.308421985 Solving -0.75 + x = 4.308421985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 4.308421985 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 4.308421985 + 0.75 x = 4.308421985 + 0.75 Combine like terms: 4.308421985 + 0.75 = 5.058421985 x = 5.058421985 Simplifying x = 5.058421985

Subproblem 2

x + -0.75 = -4.308421985 Simplifying x + -0.75 = -4.308421985 Reorder the terms: -0.75 + x = -4.308421985 Solving -0.75 + x = -4.308421985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -4.308421985 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -4.308421985 + 0.75 x = -4.308421985 + 0.75 Combine like terms: -4.308421985 + 0.75 = -3.558421985 x = -3.558421985 Simplifying x = -3.558421985

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.058421985, -3.558421985}

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