PLEASE HELP QUICK!! ALGEBRA 2

state if the given binomial is a factor of the given polynomial. show all work needed to determine this.

1) (12r³-18r²-90r-49) / (4r+6)

and

2) (70x³-31x²+83x-24) / (10x-3)

what do i do when there's a number before the x/r in the binomial??? help