8x^2+25x+19=0

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Solution for 8x^2+25x+19=0 equation:


Simplifying
8x2 + 25x + 19 = 0

Reorder the terms:
19 + 25x + 8x2 = 0

Solving
19 + 25x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
2.375 + 3.125x + x2 = 0

Move the constant term to the right:

Add '-2.375' to each side of the equation.
2.375 + 3.125x + -2.375 + x2 = 0 + -2.375

Reorder the terms:
2.375 + -2.375 + 3.125x + x2 = 0 + -2.375

Combine like terms: 2.375 + -2.375 = 0.000
0.000 + 3.125x + x2 = 0 + -2.375
3.125x + x2 = 0 + -2.375

Combine like terms: 0 + -2.375 = -2.375
3.125x + x2 = -2.375

The x term is 3.125x.  Take half its coefficient (1.5625).
Square it (2.44140625) and add it to both sides.

Add '2.44140625' to each side of the equation.
3.125x + 2.44140625 + x2 = -2.375 + 2.44140625

Reorder the terms:
2.44140625 + 3.125x + x2 = -2.375 + 2.44140625

Combine like terms: -2.375 + 2.44140625 = 0.06640625
2.44140625 + 3.125x + x2 = 0.06640625

Factor a perfect square on the left side:
(x + 1.5625)(x + 1.5625) = 0.06640625

Calculate the square root of the right side: 0.257694102

Break this problem into two subproblems by setting 
(x + 1.5625) equal to 0.257694102 and -0.257694102.

Subproblem 1

x + 1.5625 = 0.257694102 Simplifying x + 1.5625 = 0.257694102 Reorder the terms: 1.5625 + x = 0.257694102 Solving 1.5625 + x = 0.257694102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5625' to each side of the equation. 1.5625 + -1.5625 + x = 0.257694102 + -1.5625 Combine like terms: 1.5625 + -1.5625 = 0.0000 0.0000 + x = 0.257694102 + -1.5625 x = 0.257694102 + -1.5625 Combine like terms: 0.257694102 + -1.5625 = -1.304805898 x = -1.304805898 Simplifying x = -1.304805898

Subproblem 2

x + 1.5625 = -0.257694102 Simplifying x + 1.5625 = -0.257694102 Reorder the terms: 1.5625 + x = -0.257694102 Solving 1.5625 + x = -0.257694102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5625' to each side of the equation. 1.5625 + -1.5625 + x = -0.257694102 + -1.5625 Combine like terms: 1.5625 + -1.5625 = 0.0000 0.0000 + x = -0.257694102 + -1.5625 x = -0.257694102 + -1.5625 Combine like terms: -0.257694102 + -1.5625 = -1.820194102 x = -1.820194102 Simplifying x = -1.820194102

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.304805898, -1.820194102}

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