2x^2-3x-216=0

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Solution for 2x^2-3x-216=0 equation:


Simplifying
2x2 + -3x + -216 = 0

Reorder the terms:
-216 + -3x + 2x2 = 0

Solving
-216 + -3x + 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'.
-108 + -1.5x + x2 = 0

Move the constant term to the right:

Add '108' to each side of the equation.
-108 + -1.5x + 108 + x2 = 0 + 108

Reorder the terms:
-108 + 108 + -1.5x + x2 = 0 + 108

Combine like terms: -108 + 108 = 0
0 + -1.5x + x2 = 0 + 108
-1.5x + x2 = 0 + 108

Combine like terms: 0 + 108 = 108
-1.5x + x2 = 108

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 = 108 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 108 + 0.5625

Combine like terms: 108 + 0.5625 = 108.5625
0.5625 + -1.5x + x2 = 108.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 108.5625

Calculate the square root of the right side: 10.419332992

Break this problem into two subproblems by setting 
(x + -0.75) equal to 10.419332992 and -10.419332992.

Subproblem 1

x + -0.75 = 10.419332992 Simplifying x + -0.75 = 10.419332992 Reorder the terms: -0.75 + x = 10.419332992 Solving -0.75 + x = 10.419332992 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 = 10.419332992 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 10.419332992 + 0.75 x = 10.419332992 + 0.75 Combine like terms: 10.419332992 + 0.75 = 11.169332992 x = 11.169332992 Simplifying x = 11.169332992

Subproblem 2

x + -0.75 = -10.419332992 Simplifying x + -0.75 = -10.419332992 Reorder the terms: -0.75 + x = -10.419332992 Solving -0.75 + x = -10.419332992 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 = -10.419332992 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -10.419332992 + 0.75 x = -10.419332992 + 0.75 Combine like terms: -10.419332992 + 0.75 = -9.669332992 x = -9.669332992 Simplifying x = -9.669332992

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.169332992, -9.669332992}

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