8x^2+17x+6=0

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Solution for 8x^2+17x+6=0 equation:


Simplifying
8x2 + 17x + 6 = 0

Reorder the terms:
6 + 17x + 8x2 = 0

Solving
6 + 17x + 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'.
0.75 + 2.125x + x2 = 0

Move the constant term to the right:

Add '-0.75' to each side of the equation.
0.75 + 2.125x + -0.75 + x2 = 0 + -0.75

Reorder the terms:
0.75 + -0.75 + 2.125x + x2 = 0 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + 2.125x + x2 = 0 + -0.75
2.125x + x2 = 0 + -0.75

Combine like terms: 0 + -0.75 = -0.75
2.125x + x2 = -0.75

The x term is 2.125x.  Take half its coefficient (1.0625).
Square it (1.12890625) and add it to both sides.

Add '1.12890625' to each side of the equation.
2.125x + 1.12890625 + x2 = -0.75 + 1.12890625

Reorder the terms:
1.12890625 + 2.125x + x2 = -0.75 + 1.12890625

Combine like terms: -0.75 + 1.12890625 = 0.37890625
1.12890625 + 2.125x + x2 = 0.37890625

Factor a perfect square on the left side:
(x + 1.0625)(x + 1.0625) = 0.37890625

Calculate the square root of the right side: 0.615553613

Break this problem into two subproblems by setting 
(x + 1.0625) equal to 0.615553613 and -0.615553613.

Subproblem 1

x + 1.0625 = 0.615553613 Simplifying x + 1.0625 = 0.615553613 Reorder the terms: 1.0625 + x = 0.615553613 Solving 1.0625 + x = 0.615553613 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.0625' to each side of the equation. 1.0625 + -1.0625 + x = 0.615553613 + -1.0625 Combine like terms: 1.0625 + -1.0625 = 0.0000 0.0000 + x = 0.615553613 + -1.0625 x = 0.615553613 + -1.0625 Combine like terms: 0.615553613 + -1.0625 = -0.446946387 x = -0.446946387 Simplifying x = -0.446946387

Subproblem 2

x + 1.0625 = -0.615553613 Simplifying x + 1.0625 = -0.615553613 Reorder the terms: 1.0625 + x = -0.615553613 Solving 1.0625 + x = -0.615553613 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.0625' to each side of the equation. 1.0625 + -1.0625 + x = -0.615553613 + -1.0625 Combine like terms: 1.0625 + -1.0625 = 0.0000 0.0000 + x = -0.615553613 + -1.0625 x = -0.615553613 + -1.0625 Combine like terms: -0.615553613 + -1.0625 = -1.678053613 x = -1.678053613 Simplifying x = -1.678053613

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.446946387, -1.678053613}

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