11=6x^2-30x-36

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Solution for 11=6x^2-30x-36 equation:


Simplifying
11 = 6x2 + -30x + -36

Reorder the terms:
11 = -36 + -30x + 6x2

Solving
11 = -36 + -30x + 6x2

Solving for variable 'x'.

Combine like terms: 11 + 36 = 47
47 + 30x + -6x2 = -36 + -30x + 6x2 + 36 + 30x + -6x2

Reorder the terms:
47 + 30x + -6x2 = -36 + 36 + -30x + 30x + 6x2 + -6x2

Combine like terms: -36 + 36 = 0
47 + 30x + -6x2 = 0 + -30x + 30x + 6x2 + -6x2
47 + 30x + -6x2 = -30x + 30x + 6x2 + -6x2

Combine like terms: -30x + 30x = 0
47 + 30x + -6x2 = 0 + 6x2 + -6x2
47 + 30x + -6x2 = 6x2 + -6x2

Combine like terms: 6x2 + -6x2 = 0
47 + 30x + -6x2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
-7.833333333 + -5x + x2 = 0

Move the constant term to the right:

Add '7.833333333' to each side of the equation.
-7.833333333 + -5x + 7.833333333 + x2 = 0 + 7.833333333

Reorder the terms:
-7.833333333 + 7.833333333 + -5x + x2 = 0 + 7.833333333

Combine like terms: -7.833333333 + 7.833333333 = 0.000000000
0.000000000 + -5x + x2 = 0 + 7.833333333
-5x + x2 = 0 + 7.833333333

Combine like terms: 0 + 7.833333333 = 7.833333333
-5x + x2 = 7.833333333

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 7.833333333 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 7.833333333 + 6.25

Combine like terms: 7.833333333 + 6.25 = 14.083333333
6.25 + -5x + x2 = 14.083333333

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 14.083333333

Calculate the square root of the right side: 3.75277675

Break this problem into two subproblems by setting 
(x + -2.5) equal to 3.75277675 and -3.75277675.

Subproblem 1

x + -2.5 = 3.75277675 Simplifying x + -2.5 = 3.75277675 Reorder the terms: -2.5 + x = 3.75277675 Solving -2.5 + x = 3.75277675 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 3.75277675 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 3.75277675 + 2.5 x = 3.75277675 + 2.5 Combine like terms: 3.75277675 + 2.5 = 6.25277675 x = 6.25277675 Simplifying x = 6.25277675

Subproblem 2

x + -2.5 = -3.75277675 Simplifying x + -2.5 = -3.75277675 Reorder the terms: -2.5 + x = -3.75277675 Solving -2.5 + x = -3.75277675 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -3.75277675 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -3.75277675 + 2.5 x = -3.75277675 + 2.5 Combine like terms: -3.75277675 + 2.5 = -1.25277675 x = -1.25277675 Simplifying x = -1.25277675

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.25277675, -1.25277675}

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