5x^2+19x+4=0

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Solution for 5x^2+19x+4=0 equation:


Simplifying
5x2 + 19x + 4 = 0

Reorder the terms:
4 + 19x + 5x2 = 0

Solving
4 + 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'.
0.8 + 3.8x + x2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 3.8x + -0.8 + x2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 3.8x + x2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 3.8x + x2 = 0 + -0.8
3.8x + x2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
3.8x + x2 = -0.8

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 = -0.8 + 3.61

Reorder the terms:
3.61 + 3.8x + x2 = -0.8 + 3.61

Combine like terms: -0.8 + 3.61 = 2.81
3.61 + 3.8x + x2 = 2.81

Factor a perfect square on the left side:
(x + 1.9)(x + 1.9) = 2.81

Calculate the square root of the right side: 1.676305461

Break this problem into two subproblems by setting 
(x + 1.9) equal to 1.676305461 and -1.676305461.

Subproblem 1

x + 1.9 = 1.676305461 Simplifying x + 1.9 = 1.676305461 Reorder the terms: 1.9 + x = 1.676305461 Solving 1.9 + x = 1.676305461 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 = 1.676305461 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = 1.676305461 + -1.9 x = 1.676305461 + -1.9 Combine like terms: 1.676305461 + -1.9 = -0.223694539 x = -0.223694539 Simplifying x = -0.223694539

Subproblem 2

x + 1.9 = -1.676305461 Simplifying x + 1.9 = -1.676305461 Reorder the terms: 1.9 + x = -1.676305461 Solving 1.9 + x = -1.676305461 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 = -1.676305461 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = -1.676305461 + -1.9 x = -1.676305461 + -1.9 Combine like terms: -1.676305461 + -1.9 = -3.576305461 x = -3.576305461 Simplifying x = -3.576305461

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.223694539, -3.576305461}

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