2x^2+19x=9

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Solution for 2x^2+19x=9 equation:


Simplifying
2x2 + 19x = 9

Reorder the terms:
19x + 2x2 = 9

Solving
19x + 2x2 = 9

Solving for variable 'x'.

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

Combine like terms: 9 + -9 = 0
-9 + 19x + 2x2 = 0

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

Divide each side by '2'.
-4.5 + 9.5x + x2 = 0

Move the constant term to the right:

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

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

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

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

The x term is 9.5x.  Take half its coefficient (4.75).
Square it (22.5625) and add it to both sides.

Add '22.5625' to each side of the equation.
9.5x + 22.5625 + x2 = 4.5 + 22.5625

Reorder the terms:
22.5625 + 9.5x + x2 = 4.5 + 22.5625

Combine like terms: 4.5 + 22.5625 = 27.0625
22.5625 + 9.5x + x2 = 27.0625

Factor a perfect square on the left side:
(x + 4.75)(x + 4.75) = 27.0625

Calculate the square root of the right side: 5.202163012

Break this problem into two subproblems by setting 
(x + 4.75) equal to 5.202163012 and -5.202163012.

Subproblem 1

x + 4.75 = 5.202163012 Simplifying x + 4.75 = 5.202163012 Reorder the terms: 4.75 + x = 5.202163012 Solving 4.75 + x = 5.202163012 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.75' to each side of the equation. 4.75 + -4.75 + x = 5.202163012 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = 5.202163012 + -4.75 x = 5.202163012 + -4.75 Combine like terms: 5.202163012 + -4.75 = 0.452163012 x = 0.452163012 Simplifying x = 0.452163012

Subproblem 2

x + 4.75 = -5.202163012 Simplifying x + 4.75 = -5.202163012 Reorder the terms: 4.75 + x = -5.202163012 Solving 4.75 + x = -5.202163012 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.75' to each side of the equation. 4.75 + -4.75 + x = -5.202163012 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = -5.202163012 + -4.75 x = -5.202163012 + -4.75 Combine like terms: -5.202163012 + -4.75 = -9.952163012 x = -9.952163012 Simplifying x = -9.952163012

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.452163012, -9.952163012}

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