Does anyone know the answer to this with an explanation?

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Plzzz plzz maths ! quadratic sequences =an^2+bn 1) 1,6,15,28,45 2)5,18,39,68,105 3) 1,8,21,40,65 4) 7,24,51,88,135 5) -1,2,9,20,35

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18