Answer:
The answers are :
option 1,option 3 and option 4.
Step-by-step explanation:
in first option:
[tex]=6fg^3+4-4f^2g^2+f^3g-12[/tex]
clearly we could see that there are no like terms hence we could not simplify the expression.
in second option:
[tex]=6fg^3+2f(2fg)+4f^2g-10[/tex]
this expression could also be written as:
[tex]=6fg^3+4f^2g+4f^2g-10\\\\=6fg^3+8f^2g-10[/tex]
in third option:
[tex]6fg^3+5f^2g^2+f^3g-7[/tex]
as there are no like terms hence the expression can't be simplified.
in fourth option:
[tex]=6f^3g^3+7f^2g^2+4f^3g^2-10fg[/tex]
as there are no like terms hence the expression can't be simplified.
Hence option 1, option 3 and option 4 are the answers.
