33x=3x^2-7x-18

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Solution for 33x=3x^2-7x-18 equation:


Simplifying
33x = 3x2 + -7x + -18

Reorder the terms:
33x = -18 + -7x + 3x2

Solving
33x = -18 + -7x + 3x2

Solving for variable 'x'.

Reorder the terms:
18 + 33x + 7x + -3x2 = -18 + -7x + 3x2 + 18 + 7x + -3x2

Combine like terms: 33x + 7x = 40x
18 + 40x + -3x2 = -18 + -7x + 3x2 + 18 + 7x + -3x2

Reorder the terms:
18 + 40x + -3x2 = -18 + 18 + -7x + 7x + 3x2 + -3x2

Combine like terms: -18 + 18 = 0
18 + 40x + -3x2 = 0 + -7x + 7x + 3x2 + -3x2
18 + 40x + -3x2 = -7x + 7x + 3x2 + -3x2

Combine like terms: -7x + 7x = 0
18 + 40x + -3x2 = 0 + 3x2 + -3x2
18 + 40x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
18 + 40x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-6 + -13.33333333x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -13.33333333x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -13.33333333x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -13.33333333x + x2 = 0 + 6
-13.33333333x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-13.33333333x + x2 = 6

The x term is -13.33333333x.  Take half its coefficient (-6.666666665).
Square it (44.44444442) and add it to both sides.

Add '44.44444442' to each side of the equation.
-13.33333333x + 44.44444442 + x2 = 6 + 44.44444442

Reorder the terms:
44.44444442 + -13.33333333x + x2 = 6 + 44.44444442

Combine like terms: 6 + 44.44444442 = 50.44444442
44.44444442 + -13.33333333x + x2 = 50.44444442

Factor a perfect square on the left side:
(x + -6.666666665)(x + -6.666666665) = 50.44444442

Calculate the square root of the right side: 7.102425249

Break this problem into two subproblems by setting 
(x + -6.666666665) equal to 7.102425249 and -7.102425249.

Subproblem 1

x + -6.666666665 = 7.102425249 Simplifying x + -6.666666665 = 7.102425249 Reorder the terms: -6.666666665 + x = 7.102425249 Solving -6.666666665 + x = 7.102425249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.666666665' to each side of the equation. -6.666666665 + 6.666666665 + x = 7.102425249 + 6.666666665 Combine like terms: -6.666666665 + 6.666666665 = 0.000000000 0.000000000 + x = 7.102425249 + 6.666666665 x = 7.102425249 + 6.666666665 Combine like terms: 7.102425249 + 6.666666665 = 13.769091914 x = 13.769091914 Simplifying x = 13.769091914

Subproblem 2

x + -6.666666665 = -7.102425249 Simplifying x + -6.666666665 = -7.102425249 Reorder the terms: -6.666666665 + x = -7.102425249 Solving -6.666666665 + x = -7.102425249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.666666665' to each side of the equation. -6.666666665 + 6.666666665 + x = -7.102425249 + 6.666666665 Combine like terms: -6.666666665 + 6.666666665 = 0.000000000 0.000000000 + x = -7.102425249 + 6.666666665 x = -7.102425249 + 6.666666665 Combine like terms: -7.102425249 + 6.666666665 = -0.435758584 x = -0.435758584 Simplifying x = -0.435758584

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.769091914, -0.435758584}

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