Question

Find the first five terms and then write them in sequence. f(n) =(-1)^n.n​

Answer 1

We have, an=(−1)n−1.2n

Putting n=1,2,3,4 and 5, we get

a1=(−1)1−1×21=(−1)0×2=2

a2=(−1)2−1×22=(−1)1×4=−4

a3=(−1)3−1×23=(−1)2×8=8

a4=(−1)4−1×24=(−1)3×16=−16

and, a5=(−1)5−1×25=(−1)4×32=32

The first five terms are 2,−4,8,−16,32

Answer 2

Step-by-step explanation:

Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe. The earliest roots of science can be traced to Ancient Egypt and Mesopotamia in around 3000 to 1200 BCE

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