Question

pls give correct answer and explanation also


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Answer 1

Answer:

Sn = 2n² + 8n (Given)

330 = 2n² + 8n

2n² + 8n – 330 = 0

n² + 4n – 165 = 0

n² + 15n – 11n – 165 = 0

n(n + 15) – 11 (n + 15) = 0

(n + 15) (n – 11) = 0 If n + 15 = 0 ⇒ n = – 15 (terms are not negative)

n – 11 = 0 ⇒ n = 11

∴ Hence, total 11 term from starting to be added.

Answer 2

Answer:

Sn = 2n² + 8n (Given)

330 = 2n² + 8n

2n²+8n-330 = 0

n² + 4n - 165 = 0

n² +15n-11n - 165 = 0

n(n+15) - 11 (n + 15) = 0

(n+15) (n-11) = 0 If n + 150 n = - 15 (terms are not negative)

n-11=0 n = 11

Hence, total 11 term from starting to be added.

Step-by-step explanation:

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