Kahwai's answer to Rae Kuan's Junior College 1 H2 Maths Singapore question.
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Use GP formula
Sn
Tn
Split even and odd terms
Both is GP with ratio r^2 ( you may need to verify that)
Then solve it
First
A(1-r^8) is a figure with r
Then sub into Tn equation, solve for r
Using
A^2 - B^2 = (A+B) (A-B), got it?
Try to redo the sum, you will understand
Sn
Tn
Split even and odd terms
Both is GP with ratio r^2 ( you may need to verify that)
Then solve it
First
A(1-r^8) is a figure with r
Then sub into Tn equation, solve for r
Using
A^2 - B^2 = (A+B) (A-B), got it?
Try to redo the sum, you will understand
Date Posted:
4 years ago
Thank you, I'll try
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