1 is 4, 2 is 10, 3 is 18 and 4 is 28 for patterns what is the algebraic expression

1 4
2 10
3 18
4 28
n ?

 

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1 Answer

4, 10, 18, 28

differ=6, 8, 10

next term...add 12

28+12=40

after the first term, number=n*(n+3)
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