2x^2-3x-198=0

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Solution for 2x^2-3x-198=0 equation: 


Simplifying
2x2 + -3x + -198 = 0

Reorder the terms:
-198 + -3x + 2x2 = 0

Solving
-198 + -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'.
-99 + -1.5x + x2 = 0

Move the constant term to the right:

Add '99' to each side of the equation.
-99 + -1.5x + 99 + x2 = 0 + 99

Reorder the terms:
-99 + 99 + -1.5x + x2 = 0 + 99

Combine like terms: -99 + 99 = 0
0 + -1.5x + x2 = 0 + 99
-1.5x + x2 = 0 + 99

Combine like terms: 0 + 99 = 99
-1.5x + x2 = 99

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 = 99 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 99 + 0.5625

Combine like terms: 99 + 0.5625 = 99.5625
0.5625 + -1.5x + x2 = 99.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 99.5625

Calculate the square root of the right side: 9.978101022

Break this problem into two subproblems by setting 
(x + -0.75) equal to 9.978101022 and -9.978101022.


Subproblem 1
x + -0.75 = 9.978101022

Simplifying
x + -0.75 = 9.978101022

Reorder the terms:
-0.75 + x = 9.978101022

Solving
-0.75 + x = 9.978101022

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 = 9.978101022 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + x = 9.978101022 + 0.75
x = 9.978101022 + 0.75

Combine like terms: 9.978101022 + 0.75 = 10.728101022
x = 10.728101022

Simplifying
x = 10.728101022


Subproblem 2
x + -0.75 = -9.978101022

Simplifying
x + -0.75 = -9.978101022

Reorder the terms:
-0.75 + x = -9.978101022

Solving
-0.75 + x = -9.978101022

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 = -9.978101022 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + x = -9.978101022 + 0.75
x = -9.978101022 + 0.75

Combine like terms: -9.978101022 + 0.75 = -9.228101022
x = -9.228101022

Simplifying
x = -9.228101022


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {10.728101022, -9.228101022}

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