the product of the 1 st two terms of the arithmetic sequence with common difference 6 is 135.find the 1 st term ?
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Answer:
-15 or 7
Step-by-step explanation:
let first term is a and common difference is d.
a(a+d)=135
a(a+6)=135
a^2+6a-135=0
(a+15)(a-7) =0
a=-15 or a=7
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