n(n+1 + [15)(1) Evaluate the sum: Useful Formulas: ¿ 1 = n, x = "ht !)= m(n+1)/2n + 1) [(k-1) – 8(k – 1) – 13] 3 (k- – ]

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N N 1 15 1 Evaluate The Sum Useful Formulas 1 N X Ht M N 1 2n 1 K 1 8 K 1 13 3 K 1 (54.33 KiB) Viewed 19 times

this is the example my teacher gave me but I'm a little confused on how to do it
this is the example my teacher gave me but I'm a little confused on how to do it

N N 1 15 1 Evaluate The Sum Useful Formulas 1 N X Ht M N 1 2n 1 K 1 8 K 1 13 3 K 2 (54.33 KiB) Viewed 19 times

N N 1 15 1 Evaluate The Sum Useful Formulas 1 N X Ht M N 1 2n 1 K 1 8 K 1 13 3 K 3 (16.35 KiB) Viewed 19 times

n(n+1 + [15)(1) Evaluate the sum: Useful Formulas: ¿ 1 = n, x = "ht !)= m(n+1)/2n + 1) [(k-1) – 8(k – 1) – 13] 3 (k- – ] 8k 13 12 k k=3 k= 2 [(-1)€– 8(-1)=1] = *(** -86–13) = -(1-8-19)+ Ź (62-86–12 kFk+1 INDEX-SHIFT 12 = + k13) k=1 ADJUSTMENT = 20 +Σ+2 – 8Σ -13 Σ1 LINEARITY 12.13-25 20 + 6 8(12:13) - 13-12 8 FORMULAS - 20 + 2.13-25 – 8-6-13 -13.2-6 SIMPLIFYING 20 + 2013 ( 25 – 4-6-6) FACTORING 20 + 2013 (-5) 10 (2 - 13) = 10(-11) -110 FACTORING ICT VEY PAGE 5 of

1+1) n(n+1) 2n+ 1) = 1, 101 (1) Evaluate the sum: Useful Formulas: Σ1 - . Σ- 1(1, Σ ΣΙ(k - 2) - 6(k – 2) + 8] Ε