-8x^2-6x-36=0

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Solution for -8x^2-6x-36=0 equation: 


Simplifying
-8x2 + -6x + -36 = 0

Reorder the terms:
-36 + -6x + -8x2 = 0

Solving
-36 + -6x + -8x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-2'.
-2(18 + 3x + 4x2) = 0

Ignore the factor -2.

Subproblem 1
Set the factor '(18 + 3x + 4x2)' equal to zero and attempt to solve:

Simplifying
18 + 3x + 4x2 = 0

Solving
18 + 3x + 4x2 = 0

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

Divide each side by '4'.
4.5 + 0.75x + x2 = 0

Move the constant term to the right:

Add '-4.5' to each side of the equation.
4.5 + 0.75x + -4.5 + x2 = 0 + -4.5

Reorder the terms:
4.5 + -4.5 + 0.75x + x2 = 0 + -4.5

Combine like terms: 4.5 + -4.5 = 0.0
0.0 + 0.75x + x2 = 0 + -4.5
0.75x + x2 = 0 + -4.5

Combine like terms: 0 + -4.5 = -4.5
0.75x + x2 = -4.5

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = -4.5 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = -4.5 + 0.140625

Combine like terms: -4.5 + 0.140625 = -4.359375
0.140625 + 0.75x + x2 = -4.359375

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = -4.359375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.

The solution to this equation could not be determined.

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