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find a G.P for which sum of the first two terms is -4 and the fifth term is 4 times the third term |
| Given that a+ ar = -4 =>a(1+r) = -4 ........(i) and ar4 = 4ar2 => r2 = 4 ie, r = ±2 from (i), a(1±2)=-4 ie, 3a= -4 or -a = -4 ie, a = -4/3 a = 4 Hence the G.P is -2, -8 , -32, . . . |
