2x^2-9x-19=0

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Solution for 2x^2-9x-19=0 equation:


Simplifying
2x2 + -9x + -19 = 0

Reorder the terms:
-19 + -9x + 2x2 = 0

Solving
-19 + -9x + 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 + -4.5x + x2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + -4.5x + 9.5 + x2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + -4.5x + x2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + -4.5x + x2 = 0 + 9.5
-4.5x + x2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
-4.5x + x2 = 9.5

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 9.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 9.5 + 5.0625

Combine like terms: 9.5 + 5.0625 = 14.5625
5.0625 + -4.5x + x2 = 14.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 14.5625

Calculate the square root of the right side: 3.816084381

Break this problem into two subproblems by setting 
(x + -2.25) equal to 3.816084381 and -3.816084381.

Subproblem 1

x + -2.25 = 3.816084381 Simplifying x + -2.25 = 3.816084381 Reorder the terms: -2.25 + x = 3.816084381 Solving -2.25 + x = 3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 3.816084381 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 3.816084381 + 2.25 x = 3.816084381 + 2.25 Combine like terms: 3.816084381 + 2.25 = 6.066084381 x = 6.066084381 Simplifying x = 6.066084381

Subproblem 2

x + -2.25 = -3.816084381 Simplifying x + -2.25 = -3.816084381 Reorder the terms: -2.25 + x = -3.816084381 Solving -2.25 + x = -3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -3.816084381 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -3.816084381 + 2.25 x = -3.816084381 + 2.25 Combine like terms: -3.816084381 + 2.25 = -1.566084381 x = -1.566084381 Simplifying x = -1.566084381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.066084381, -1.566084381}

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