Answer :

Using arithmetic sequence equation

⇒ n^{2} + 4n – 140 = 0

⇒ n^{2} + 14n – 10n – 140 = 0

⇒ n(n + 14) – 10(n + 14) = 0

⇒ (n + 14) (n – 10) = 0

x = –14 as we cannot have negative number of terms.

Therefore x = 10, the number of terms is 10

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