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in a geomatric progressionthe second term is 9 less than the first term.the sum of the second and thirdterm os 30,given that all termsi the progression are positive,find the first term..... NEED HELP HERE GUYS 
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sequences
- Thread starter nigga7
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You need to use simultaneous equation. Equate what you just type out in maths terms.
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can u write the solution here?
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1st term = a
2nd term = a-9
third term = ar^2
Sum = a-9 + ar^2 = 30
When you make r the subject of the equation you get (r^2 = 39/a - 1)
Then you substitute r in the sum equation, and you get a
2nd term = a-9
third term = ar^2
Sum = a-9 + ar^2 = 30
When you make r the subject of the equation you get (r^2 = 39/a - 1)
Then you substitute r in the sum equation, and you get a