8x^2-28x-19=0

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Solution for 8x^2-28x-19=0 equation:


Simplifying
8x2 + -28x + -19 = 0

Reorder the terms:
-19 + -28x + 8x2 = 0

Solving
-19 + -28x + 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 + -3.5x + x2 = 0

Move the constant term to the right:

Add '2.375' to each side of the equation.
-2.375 + -3.5x + 2.375 + x2 = 0 + 2.375

Reorder the terms:
-2.375 + 2.375 + -3.5x + x2 = 0 + 2.375

Combine like terms: -2.375 + 2.375 = 0.000
0.000 + -3.5x + x2 = 0 + 2.375
-3.5x + x2 = 0 + 2.375

Combine like terms: 0 + 2.375 = 2.375
-3.5x + x2 = 2.375

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 2.375 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 2.375 + 3.0625

Combine like terms: 2.375 + 3.0625 = 5.4375
3.0625 + -3.5x + x2 = 5.4375

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 5.4375

Calculate the square root of the right side: 2.331844763

Break this problem into two subproblems by setting 
(x + -1.75) equal to 2.331844763 and -2.331844763.

Subproblem 1

x + -1.75 = 2.331844763 Simplifying x + -1.75 = 2.331844763 Reorder the terms: -1.75 + x = 2.331844763 Solving -1.75 + x = 2.331844763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 2.331844763 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 2.331844763 + 1.75 x = 2.331844763 + 1.75 Combine like terms: 2.331844763 + 1.75 = 4.081844763 x = 4.081844763 Simplifying x = 4.081844763

Subproblem 2

x + -1.75 = -2.331844763 Simplifying x + -1.75 = -2.331844763 Reorder the terms: -1.75 + x = -2.331844763 Solving -1.75 + x = -2.331844763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -2.331844763 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -2.331844763 + 1.75 x = -2.331844763 + 1.75 Combine like terms: -2.331844763 + 1.75 = -0.581844763 x = -0.581844763 Simplifying x = -0.581844763

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.081844763, -0.581844763}

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