If...=50,what is the value of x ?

Which is an equation for the nth terms of the sequence 12,15,18,21

Two positive integers are 3 units apart on a number line. their product is 108. which equation can be used to solve for m, the greater integer? m(m – 3) = 108 m(m + 3) = 108 (m + 3)(m – 3) = 108 (m – 12)(m – 9) = 108

Pls brainliest will be awarded if answer is correct