The first, second and third terms of an exponential sequence (G.P) are (x - 4), (x + 2), and (3x + 1) respectively. Find the values of x.

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

Question 1 Report

The first, second and third terms of an exponential sequence (G.P) are (x - 4), (x + 2), and (3x + 1) respectively. Find the values of x.
Answer Details

U1 = x - 4
U2 = x + 2
U3 = 3x + 1

u2u1=u3u2

x+2x−4=3x+1x+2

(x+2)(x+2) = (x-4)(3x+1)
x2 2  + 4x + 4 = 3x2 - 11x - 4
collecting like terms
2x2 2  - 15x - 8 =0
2x2 2  + x - 16x - 8 = 0
x(2x + 1) - 8(2x + 1) = 0
(x-8)(2x+1) = 0

x = (−12,8 − 1 2 , 8 )

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