Geometric Sequence

Scrutinize

Junior Member
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Sep 16, 2019
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a, b,c,d are all consecutive numbers in a geometric sequence ( as in ) a1,a2,a3,a4 respectively.

a*d=24

b^3 + c^3=288

What is a + b?

I got a = 6 and d = 4 and a+d was equal to 10. I don't remember how I did the question exactly but I just wanted to see if I got the right answer? What I do remember doing was I substituted each b c d with a's multiplied by q. Then I got a*a*q^3=24 or a^2*q^3=24 and I substituted it into the b's and c's and got a from that because I was able to cancel out the q's for a's I'm pretty sure. Either way I wanna see if I got the right answer and also want to know how to do the problem again so any help would be amazing.

Thanks in advance!

PS: This was one of my test questions that I completed today so trying to check my answers.
 
To check just plug in the numbers. a*d = 24? b^3 + c^3=288?
Seems like you were using the right approach. What's the problem with reproducing it?
 
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