Answer :
[tex]\\ \tt\hookrightarrow 12x^4(-56x^3y^2)[/tex]
[tex]\\ \tt\hookrightarrow -672x^{4+3}y^2[/tex]
[tex]\\ \tt\hookrightarrow -672x^7y^2[/tex]
None of the above
[tex]\\ \tt\hookrightarrow 12x^4(-56x^3y^2)[/tex]
[tex]\\ \tt\hookrightarrow -672x^{4+3}y^2[/tex]
[tex]\\ \tt\hookrightarrow -672x^7y^2[/tex]
None of the above