8x^2+65x+14=0

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Solution for 8x^2+65x+14=0 equation:


Simplifying
8x2 + 65x + 14 = 0

Reorder the terms:
14 + 65x + 8x2 = 0

Solving
14 + 65x + 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'.
1.75 + 8.125x + x2 = 0

Move the constant term to the right:

Add '-1.75' to each side of the equation.
1.75 + 8.125x + -1.75 + x2 = 0 + -1.75

Reorder the terms:
1.75 + -1.75 + 8.125x + x2 = 0 + -1.75

Combine like terms: 1.75 + -1.75 = 0.00
0.00 + 8.125x + x2 = 0 + -1.75
8.125x + x2 = 0 + -1.75

Combine like terms: 0 + -1.75 = -1.75
8.125x + x2 = -1.75

The x term is 8.125x.  Take half its coefficient (4.0625).
Square it (16.50390625) and add it to both sides.

Add '16.50390625' to each side of the equation.
8.125x + 16.50390625 + x2 = -1.75 + 16.50390625

Reorder the terms:
16.50390625 + 8.125x + x2 = -1.75 + 16.50390625

Combine like terms: -1.75 + 16.50390625 = 14.75390625
16.50390625 + 8.125x + x2 = 14.75390625

Factor a perfect square on the left side:
(x + 4.0625)(x + 4.0625) = 14.75390625

Calculate the square root of the right side: 3.841081391

Break this problem into two subproblems by setting 
(x + 4.0625) equal to 3.841081391 and -3.841081391.

Subproblem 1

x + 4.0625 = 3.841081391 Simplifying x + 4.0625 = 3.841081391 Reorder the terms: 4.0625 + x = 3.841081391 Solving 4.0625 + x = 3.841081391 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.0625' to each side of the equation. 4.0625 + -4.0625 + x = 3.841081391 + -4.0625 Combine like terms: 4.0625 + -4.0625 = 0.0000 0.0000 + x = 3.841081391 + -4.0625 x = 3.841081391 + -4.0625 Combine like terms: 3.841081391 + -4.0625 = -0.221418609 x = -0.221418609 Simplifying x = -0.221418609

Subproblem 2

x + 4.0625 = -3.841081391 Simplifying x + 4.0625 = -3.841081391 Reorder the terms: 4.0625 + x = -3.841081391 Solving 4.0625 + x = -3.841081391 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.0625' to each side of the equation. 4.0625 + -4.0625 + x = -3.841081391 + -4.0625 Combine like terms: 4.0625 + -4.0625 = 0.0000 0.0000 + x = -3.841081391 + -4.0625 x = -3.841081391 + -4.0625 Combine like terms: -3.841081391 + -4.0625 = -7.903581391 x = -7.903581391 Simplifying x = -7.903581391

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.221418609, -7.903581391}

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