If 5,x,t,z,405 are the first five terms of a G.P. find the values if x,y and z.
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Answered by
2
ar^n-1=nth term
5r^5-1=405
r^4=81
r=3
therefore x=15,y=45 and z=135
5r^5-1=405
r^4=81
r=3
therefore x=15,y=45 and z=135
Answered by
3
See
This is a G.P.
So let terms be a,a*r,a*r*r,a*r*r*r and a*(r^4)
Thus a=5
Also a*(r^4)=405
5*(r^4)=405
r^4=81
So r=3
Thus x=a*r=5*3=15
y=45
z=135
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This is a G.P.
So let terms be a,a*r,a*r*r,a*r*r*r and a*(r^4)
Thus a=5
Also a*(r^4)=405
5*(r^4)=405
r^4=81
So r=3
Thus x=a*r=5*3=15
y=45
z=135
Give a heart if you got it :)
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