GP- first term

Find the 1st term of the GP ___, -6, 18, -54.

Correct answer:

a1 =  2

Step-by-step explanation:

a2=6 a3=18 a4=54  a(n+1)=r a(n) a4= r a3 a3 = r a2 a2 = r a1  r=a3/a2=18/(6)=3  a1=a2/r=(6)/(3)=2

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Showing 1 comment:
Gideon Lalio
How did you get -6,18,54

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