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Tuliskan lima suku pertama barisan berikut: b.

Tuliskan lima suku pertama barisan berikut:

b. begin mathsize 14px style U subscript n equals 1 half n squared plus 2 n plus 5 end style

Jawaban:

begin mathsize 14px style U subscript n equals 1 half n squared plus 2 n plus 5 U subscript 1 equals 1 half left parenthesis 1 right parenthesis squared plus 2 left parenthesis 1 right parenthesis plus 5 equals 15 over 2 U subscript 2 equals 1 half left parenthesis 2 right parenthesis squared plus 2 left parenthesis 2 right parenthesis plus 5 equals 11 U subscript 3 equals 1 half left parenthesis 3 right parenthesis squared plus 2 left parenthesis 3 right parenthesis plus 5 equals 31 over 2 U subscript 4 equals 1 half left parenthesis 4 right parenthesis squared plus 2 left parenthesis 4 right parenthesis plus 5 equals 21 U subscript 5 equals 1 half left parenthesis 5 right parenthesis squared plus 2 left parenthesis 5 right parenthesis plus 5 equals 55 over 2  Jadi comma space barisan space nya space adalah space 15 over 2 comma space 11 comma space 31 over 2 comma space 21 comma space 55 over 2 comma... end style

 

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