One +4 equals five 2+5 = 12 3+6 = 21 8+11 equals?

(1*4)+4=5, (2*5)+2=12, (3*6)+3=21, this process is repeated for the next numbers, for example, (4*7)+4=32, so when we come to eight and eleven we must do, (8*11)+8=96

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?