Please help me in this

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.