If 36, \( \frac{9}{4} \) and q are consecutive terms of an exponential sequence (G.P), find the sum of p and q.

Assessment: WAEC SSCE - Further Mathematics - 2022 (Objective) Subject: Further Mathematics

Question 1 Report

If 36, \( \frac{9}{4} \) and q are consecutive terms of an exponential sequence (G.P), find the sum of p and q.

Answer Details

GP : 36, P, q4 � 4 , q, ... p + q = ?

Recall, common ratio, r = TnTn-1 = T2T1 = T3T2 = T4T3


 

∴ P36 = 94 ÷ p ;       p2 2 = 94 x 36 ;     p2 2 = 81  


 

p = 9         ∴      r = T2T1     =   936     =  14


 

Also r  = T4T3    = q ÷ 94



∴ 14 1 4  = q ÷ 94 9 4  ;

94 9 4  = 4q

16q = 9 ,   q = 916    ∴  p + q  =  9 + 916  =  9 916

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