(-4x^2+-2x)+(-x^2-6x-8)=

Solution for (-4x^2+-2x)+(-x^2-6x-8)= equation:

Simplifying
(-4x2 + -2x) + (-1x2 + -6x + -8) = 0

Reorder the terms:
(-2x + -4x2) + (-1x2 + -6x + -8) = 0

Remove parenthesis around (-2x + -4x2)
-2x + -4x2 + (-1x2 + -6x + -8) = 0

Reorder the terms:
-2x + -4x2 + (-8 + -6x + -1x2) = 0

Remove parenthesis around (-8 + -6x + -1x2)
-2x + -4x2 + -8 + -6x + -1x2 = 0

Reorder the terms:
-8 + -2x + -6x + -4x2 + -1x2 = 0

Combine like terms: -2x + -6x = -8x
-8 + -8x + -4x2 + -1x2 = 0

Combine like terms: -4x2 + -1x2 = -5x2
-8 + -8x + -5x2 = 0

Solving
-8 + -8x + -5x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(8 + 8x + 5x2) = 0

Ignore the factor -1.
Subproblem 1
Set the factor '(8 + 8x + 5x2)' equal to zero and attempt to solve:

Simplifying
8 + 8x + 5x2 = 0

Solving
8 + 8x + 5x2 = 0

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

Divide each side by '5'.
1.6 + 1.6x + x2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + 1.6x + -1.6 + x2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + 1.6x + x2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + 1.6x + x2 = 0 + -1.6
1.6x + x2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
1.6x + x2 = -1.6

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = -1.6 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = -1.6 + 0.64

Combine like terms: -1.6 + 0.64 = -0.96
0.64 + 1.6x + x2 = -0.96

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = -0.96

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.