(-3)x^2-16x-5=80

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Solution for (-3)x^2-16x-5=80 equation: 


Simplifying
(-3) * x2 + -16x + -5 = 80

Reorder the terms:
-5 + -16x + -3x2 = 80

Solving
-5 + -16x + -3x2 = 80

Solving for variable 'x'.

Reorder the terms:
-5 + -80 + -16x + -3x2 = 80 + -80

Combine like terms: -5 + -80 = -85
-85 + -16x + -3x2 = 80 + -80

Combine like terms: 80 + -80 = 0
-85 + -16x + -3x2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(85 + 16x + 3x2) = 0

Ignore the factor -1.

Subproblem 1
Set the factor '(85 + 16x + 3x2)' equal to zero and attempt to solve:

Simplifying
85 + 16x + 3x2 = 0

Solving
85 + 16x + 3x2 = 0

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

Divide each side by '3'.
28.33333333 + 5.333333333x + x2 = 0

Move the constant term to the right:

Add '-28.33333333' to each side of the equation.
28.33333333 + 5.333333333x + -28.33333333 + x2 = 0 + -28.33333333

Reorder the terms:
28.33333333 + -28.33333333 + 5.333333333x + x2 = 0 + -28.33333333

Combine like terms: 28.33333333 + -28.33333333 = 0.00000000
0.00000000 + 5.333333333x + x2 = 0 + -28.33333333
5.333333333x + x2 = 0 + -28.33333333

Combine like terms: 0 + -28.33333333 = -28.33333333
5.333333333x + x2 = -28.33333333

The x term is 5.333333333x.  Take half its coefficient (2.666666667).
Square it (7.111111113) and add it to both sides.

Add '7.111111113' to each side of the equation.
5.333333333x + 7.111111113 + x2 = -28.33333333 + 7.111111113

Reorder the terms:
7.111111113 + 5.333333333x + x2 = -28.33333333 + 7.111111113

Combine like terms: -28.33333333 + 7.111111113 = -21.222222217
7.111111113 + 5.333333333x + x2 = -21.222222217

Factor a perfect square on the left side:
(x + 2.666666667)(x + 2.666666667) = -21.222222217

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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