Which one’s are not correct and what did they do wrong

Only LOKI is correct

Step-by-step explanation:

Elektra multiplied 8 with the inside parenthesis but it was wrong to do.

Green Goblin took 2x outside with negative sign but that is wrong

Morbius did the same mistake as Green Goblin at first step but then corrected it in the second step, still it's wrong

the quotient is 4x^2 - 27x + 167 with a remainder of -996

step-by-step explanation:

in synthetic division, use -6 as the divisor and use the coefficients {4, -3, 5, 6}:

-6     )   4     -3     5     6

                -24   162 -1002

          4   -27   167   -996

thus, the quotient is 4x^2 - 27x + 167 with a remainder of -996.

note:   your "4x°-3x+5x+6" is ambiguous / incomplete.   i had to assume that you meant '4x^3 - 3x^2 + 5x + 6."