Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 10th
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Find the first four terms of the sequences whose nth terms are given by an = 2n2 – 6 - Mathematics

Sum

Find the first four terms of the sequences whose nth terms are given by an = 2n2 – 6

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Solution

an = 2n2 – 6

a1 = 2(1)2 – 6 = 2 – 6 = – 4

a2 = 2(2)2 – 6 = 8 – 6 = 2

a3 = 2(3)2 – 6 = 18 – 6 = 12

a4 = 2(4)2 – 6 = 32 – 6 = 26

∴ The first four terms are – 4, 2, 12, 26, …

Concept: Sequence
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APPEARS IN

Samacheer Kalvi Mathematics Class 10 SSLC Tamil Nadu State Board
Chapter 2 Numbers and Sequences
Exercise 2.4 | Q 2. (iii) | Page 55
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