Decide whether the sequence is arithmetic geometric or neither 5,-10,20, - 40

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Mathematics

Gidget

5 May, 12:36

Decide whether the sequence is arithmetic geometric or neither 5,-10,20, - 40

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Ana Odom · Answer 1

Try this option^

note, that all members of this sequence have '-' and '+' and 5 * (-2) = - 10, - 10 * (-2) = 20; 20 * (-2) = - 40.

It means, that the suggested sequence is geometric, where b₁=5, q=-2.