Hey there!
[tex]\bold{3(7x+4)}\\\bold{DISTRIBUTE\downarrow}\\\bold{3(7x)+3(4)}\\\bold{3(7x)=21x}\\\bold{3(4)=12}\\\bold{= 21x +12}\\\boxed{\boxed{\bold{Answer:21x+12}}}\huge\checkmark[/tex]
Good luck on your assignment and enjoy your assignment day!
~[tex]\frak{Amphitrite1040:)}[/tex]
