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ICSE Class 10 Answered

Topic : GP

Q1. Find the GP for which the sum of the first two terms is -4 and the fifth term is 4 times the third term.

Asked by Pankaj | 07 Oct, 2018, 07:03: PM
Expert Answer
First term = a
second term = ar
third term = ar2
fifth term = ar4
a+ar=-4
ar4=4ar2
r2=4
r=+2 or -2
a+a(2)=-4
3a=-4
a=-4/3..........r=+2 
 
a+a(-2)=-4
-a=-4
a=4...........r=-2 
Answered by Arun | 08 Oct, 2018, 12:14: PM
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