2x^2-12x-135=0

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Solution for 2x^2-12x-135=0 equation:


Simplifying
2x2 + -12x + -135 = 0

Reorder the terms:
-135 + -12x + 2x2 = 0

Solving
-135 + -12x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-67.5 + -6x + x2 = 0

Move the constant term to the right:

Add '67.5' to each side of the equation.
-67.5 + -6x + 67.5 + x2 = 0 + 67.5

Reorder the terms:
-67.5 + 67.5 + -6x + x2 = 0 + 67.5

Combine like terms: -67.5 + 67.5 = 0.0
0.0 + -6x + x2 = 0 + 67.5
-6x + x2 = 0 + 67.5

Combine like terms: 0 + 67.5 = 67.5
-6x + x2 = 67.5

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 = 67.5 + 9

Reorder the terms:
9 + -6x + x2 = 67.5 + 9

Combine like terms: 67.5 + 9 = 76.5
9 + -6x + x2 = 76.5

Factor a perfect square on the left side:
(x + -3)(x + -3) = 76.5

Calculate the square root of the right side: 8.746427842

Break this problem into two subproblems by setting 
(x + -3) equal to 8.746427842 and -8.746427842.

Subproblem 1

x + -3 = 8.746427842 Simplifying x + -3 = 8.746427842 Reorder the terms: -3 + x = 8.746427842 Solving -3 + x = 8.746427842 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 = 8.746427842 + 3 Combine like terms: -3 + 3 = 0 0 + x = 8.746427842 + 3 x = 8.746427842 + 3 Combine like terms: 8.746427842 + 3 = 11.746427842 x = 11.746427842 Simplifying x = 11.746427842

Subproblem 2

x + -3 = -8.746427842 Simplifying x + -3 = -8.746427842 Reorder the terms: -3 + x = -8.746427842 Solving -3 + x = -8.746427842 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 = -8.746427842 + 3 Combine like terms: -3 + 3 = 0 0 + x = -8.746427842 + 3 x = -8.746427842 + 3 Combine like terms: -8.746427842 + 3 = -5.746427842 x = -5.746427842 Simplifying x = -5.746427842

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.746427842, -5.746427842}

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