SOLUTION: Please help me with this 1, 4, 9, 16, 2, -6, 18, 54 8, 4, 2, 1, X, x+y, x+ 2y 2, 5, 10, 17

Question 1038698: Please help me with this
1, 4, 9, 16,
2, -6, 18, 54
8, 4, 2, 1,
X, x+y, x+ 2y
2, 5, 10, 17
Answer by ikleyn(52788) (Show Source): You can put this solution on YOUR website!
.
Please help me with this

1, 4, 9, 16,          = , n = 1, 2, 3, 4

2, -6, 18, 54 

8, 4, 2, 1,          Geom. progression,  = , n= 1, 2, 3, 4

X, x+y, x+ 2y        Arithm. progression of three terms
   
2, 5, 10, 17         Consider the differences - they form an arithm. progression 3, 5, 7.

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