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ICSE Class 10 Answered

Can 2n² -7 be the n th term of an A.P.?Explain.

Asked by krcraju1973 | 10 Jun, 2019, 09:43: AM
Expert Answer
According to the question,
an = 2n2 - 7 
a1 = -5, a2 = 8 - 7 = 1, a3 = 11, a4 = 25,....
Consider,
a2 - a1 = 1 - (-5) = 6
a3 - a2 = 10
a4 - a3 = 14
As difference between two consecutive terms is not constant. 
Given sequence is not an A.P.
Answered by Sneha shidid | 10 Jun, 2019, 09:55: AM

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