5x^2+19x-9=0

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Solution for 5x^2+19x-9=0 equation:


Simplifying
5x2 + 19x + -9 = 0

Reorder the terms:
-9 + 19x + 5x2 = 0

Solving
-9 + 19x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-1.8 + 3.8x + x2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + 3.8x + 1.8 + x2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + 3.8x + x2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + 3.8x + x2 = 0 + 1.8
3.8x + x2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
3.8x + x2 = 1.8

The x term is 3.8x.  Take half its coefficient (1.9).
Square it (3.61) and add it to both sides.

Add '3.61' to each side of the equation.
3.8x + 3.61 + x2 = 1.8 + 3.61

Reorder the terms:
3.61 + 3.8x + x2 = 1.8 + 3.61

Combine like terms: 1.8 + 3.61 = 5.41
3.61 + 3.8x + x2 = 5.41

Factor a perfect square on the left side:
(x + 1.9)(x + 1.9) = 5.41

Calculate the square root of the right side: 2.32594067

Break this problem into two subproblems by setting 
(x + 1.9) equal to 2.32594067 and -2.32594067.

Subproblem 1

x + 1.9 = 2.32594067 Simplifying x + 1.9 = 2.32594067 Reorder the terms: 1.9 + x = 2.32594067 Solving 1.9 + x = 2.32594067 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = 2.32594067 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = 2.32594067 + -1.9 x = 2.32594067 + -1.9 Combine like terms: 2.32594067 + -1.9 = 0.42594067 x = 0.42594067 Simplifying x = 0.42594067

Subproblem 2

x + 1.9 = -2.32594067 Simplifying x + 1.9 = -2.32594067 Reorder the terms: 1.9 + x = -2.32594067 Solving 1.9 + x = -2.32594067 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = -2.32594067 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = -2.32594067 + -1.9 x = -2.32594067 + -1.9 Combine like terms: -2.32594067 + -1.9 = -4.22594067 x = -4.22594067 Simplifying x = -4.22594067

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.42594067, -4.22594067}

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