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Tuliskan tujuh suku pertama barisan berikut: e.

Tuliskan tujuh suku pertama barisan berikut:

e. begin mathsize 14px style U subscript n equals n cubed minus 2 n squared plus 5 end style

Jawaban:

begin mathsize 14px style U subscript n equals n cubed minus 2 n squared plus 5 U subscript 1 equals 1 cubed minus 2 left parenthesis 1 right parenthesis squared plus 5 equals 4 U subscript 2 equals 2 cubed minus 2 left parenthesis 2 right parenthesis squared plus 5 equals 5 U subscript 3 equals 3 cubed minus 2 left parenthesis 3 right parenthesis squared plus 5 equals 14 U subscript 4 equals 4 cubed minus 2 left parenthesis 4 right parenthesis squared plus 5 equals 37 U subscript 5 equals 5 cubed minus 2 left parenthesis 5 right parenthesis squared plus 5 equals 80 U subscript 6 equals 6 cubed minus 2 left parenthesis 6 right parenthesis squared plus 5 equals 149 U subscript 7 equals 7 cubed minus 2 left parenthesis 7 right parenthesis squared plus 5 equals 250  Jadi comma space barisannya space adalah space 4 comma space 5 comma space 14 comma space 37 comma space 80 comma space 149 comma space 250 comma... end style

 

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