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ICSE Class 10 Answered

The sum of three consecutive terms of AP is 25 and sum of their square is 165. find the terms
Asked by m_shailander | 17 Feb, 2019, 03:03: PM
answered-by-expert Expert Answer
let space 3 space numbers space be
straight a minus straight d comma space straight a comma space straight a plus straight d
sum space equals 25
straight a minus straight d space plus space straight a space plus space straight a plus straight d equals 3 straight a equals 25
straight a equals 25 over 3
open parentheses straight a minus straight d close parentheses squared space plus space straight a space plus space open parentheses straight a plus straight d close parentheses squared equals 165
3 straight a squared plus 2 straight d squared equals 165
straight d squared equals fraction numerator 165 minus 3 cross times open parentheses 25 over 3 close parentheses squared over denominator 2 end fraction...... negative space number space so space check space your space question comma space it space is space wrong
Answered by Arun | 17 Feb, 2019, 07:22: PM
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