19x^2+19x-4=0

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Solution for 19x^2+19x-4=0 equation:


Simplifying
19x2 + 19x + -4 = 0

Reorder the terms:
-4 + 19x + 19x2 = 0

Solving
-4 + 19x + 19x2 = 0

Solving for variable 'x'.

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

Divide each side by '19'.
-0.2105263158 + x + x2 = 0

Move the constant term to the right:

Add '0.2105263158' to each side of the equation.
-0.2105263158 + x + 0.2105263158 + x2 = 0 + 0.2105263158

Reorder the terms:
-0.2105263158 + 0.2105263158 + x + x2 = 0 + 0.2105263158

Combine like terms: -0.2105263158 + 0.2105263158 = 0.0000000000
0.0000000000 + x + x2 = 0 + 0.2105263158
x + x2 = 0 + 0.2105263158

Combine like terms: 0 + 0.2105263158 = 0.2105263158
x + x2 = 0.2105263158

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 0.2105263158 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 0.2105263158 + 0.25

Combine like terms: 0.2105263158 + 0.25 = 0.4605263158
1.25 + x2 = 0.4605263158

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.4605263158

Calculate the square root of the right side: 0.678620893

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.678620893 and -0.678620893.

Subproblem 1

x + 0.5 = 0.678620893 Simplifying x + 0.5 = 0.678620893 Reorder the terms: 0.5 + x = 0.678620893 Solving 0.5 + x = 0.678620893 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.678620893 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.678620893 + -0.5 x = 0.678620893 + -0.5 Combine like terms: 0.678620893 + -0.5 = 0.178620893 x = 0.178620893 Simplifying x = 0.178620893

Subproblem 2

x + 0.5 = -0.678620893 Simplifying x + 0.5 = -0.678620893 Reorder the terms: 0.5 + x = -0.678620893 Solving 0.5 + x = -0.678620893 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.678620893 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.678620893 + -0.5 x = -0.678620893 + -0.5 Combine like terms: -0.678620893 + -0.5 = -1.178620893 x = -1.178620893 Simplifying x = -1.178620893

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.178620893, -1.178620893}

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