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1)What are the first four terms of the sequence represented by the expression n(n-1)-5

Sagot :

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[tex]a_n=n(n-1)-5 \\ \\ a_1=1(1-1)-5=1 \times 0-5=0-5=-5 \\ a_2=2(2-1)-5=2 \times 1-5=2-5=-3 \\ a_3=3(3-1)-5=3 \times 2-5=6-5=1 \\ a_4=4(4-1)-5=4 \times 3-5=12-5=7[/tex]

The first four terms are -5, -3, 1 and 7.
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