Write an explicit formula for an, the nth term of the sequence 7, -28, 112, ....

asked Jan 24, 2022 207k views

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1 vote

t( 1 ) = 7

q = t( 2 ) ÷ t( 1 ) = - 28 ÷ 7 = - 4

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t( n ) = t( 1 ) × q^( n - 1 )

t( n ) = 7 × ( - 4 )^( n - 1 )

Lucassp answered Jan 31, 2022

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