3x^2-18x-9=10

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Solution for 3x^2-18x-9=10 equation:


Simplifying
3x2 + -18x + -9 = 10

Reorder the terms:
-9 + -18x + 3x2 = 10

Solving
-9 + -18x + 3x2 = 10

Solving for variable 'x'.

Reorder the terms:
-9 + -10 + -18x + 3x2 = 10 + -10

Combine like terms: -9 + -10 = -19
-19 + -18x + 3x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-19 + -18x + 3x2 = 0

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

Divide each side by '3'.
-6.333333333 + -6x + x2 = 0

Move the constant term to the right:

Add '6.333333333' to each side of the equation.
-6.333333333 + -6x + 6.333333333 + x2 = 0 + 6.333333333

Reorder the terms:
-6.333333333 + 6.333333333 + -6x + x2 = 0 + 6.333333333

Combine like terms: -6.333333333 + 6.333333333 = 0.000000000
0.000000000 + -6x + x2 = 0 + 6.333333333
-6x + x2 = 0 + 6.333333333

Combine like terms: 0 + 6.333333333 = 6.333333333
-6x + x2 = 6.333333333

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 6.333333333 + 9

Reorder the terms:
9 + -6x + x2 = 6.333333333 + 9

Combine like terms: 6.333333333 + 9 = 15.333333333
9 + -6x + x2 = 15.333333333

Factor a perfect square on the left side:
(x + -3)(x + -3) = 15.333333333

Calculate the square root of the right side: 3.915780041

Break this problem into two subproblems by setting 
(x + -3) equal to 3.915780041 and -3.915780041.

Subproblem 1

x + -3 = 3.915780041 Simplifying x + -3 = 3.915780041 Reorder the terms: -3 + x = 3.915780041 Solving -3 + x = 3.915780041 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 3.915780041 + 3 Combine like terms: -3 + 3 = 0 0 + x = 3.915780041 + 3 x = 3.915780041 + 3 Combine like terms: 3.915780041 + 3 = 6.915780041 x = 6.915780041 Simplifying x = 6.915780041

Subproblem 2

x + -3 = -3.915780041 Simplifying x + -3 = -3.915780041 Reorder the terms: -3 + x = -3.915780041 Solving -3 + x = -3.915780041 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -3.915780041 + 3 Combine like terms: -3 + 3 = 0 0 + x = -3.915780041 + 3 x = -3.915780041 + 3 Combine like terms: -3.915780041 + 3 = -0.915780041 x = -0.915780041 Simplifying x = -0.915780041

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.915780041, -0.915780041}

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