2x^2-6x-19=0

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Solution for 2x^2-6x-19=0 equation:


Simplifying
2x2 + -6x + -19 = 0

Reorder the terms:
-19 + -6x + 2x2 = 0

Solving
-19 + -6x + 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'.
-9.5 + -3x + x2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + -3x + 9.5 + x2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + -3x + x2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + -3x + x2 = 0 + 9.5
-3x + x2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
-3x + x2 = 9.5

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 9.5 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 9.5 + 2.25

Combine like terms: 9.5 + 2.25 = 11.75
2.25 + -3x + x2 = 11.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 11.75

Calculate the square root of the right side: 3.4278273

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.4278273 and -3.4278273.

Subproblem 1

x + -1.5 = 3.4278273 Simplifying x + -1.5 = 3.4278273 Reorder the terms: -1.5 + x = 3.4278273 Solving -1.5 + x = 3.4278273 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 3.4278273 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.4278273 + 1.5 x = 3.4278273 + 1.5 Combine like terms: 3.4278273 + 1.5 = 4.9278273 x = 4.9278273 Simplifying x = 4.9278273

Subproblem 2

x + -1.5 = -3.4278273 Simplifying x + -1.5 = -3.4278273 Reorder the terms: -1.5 + x = -3.4278273 Solving -1.5 + x = -3.4278273 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -3.4278273 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.4278273 + 1.5 x = -3.4278273 + 1.5 Combine like terms: -3.4278273 + 1.5 = -1.9278273 x = -1.9278273 Simplifying x = -1.9278273

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.9278273, -1.9278273}

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