Page 11 - Practicum 5_Buku Digital Flip pdf_Grace Margareth_Arithmetic Sequence and Series Grade XI
P. 11
Mathematics Teaching Material Sequence and Series Grade XI
Discussion :
No. Discussion Score
1 Is known : = 5 − 2
2
Asked: − = ⋯ ?
5
3
Answer :
⟺ −
3
5
2
⟺ (5 − 2(3) ) − (5 − 2(5) ) 20
2
⟺ 95 − 2(9)) − (5 − 2(25))
⟺ (−13) − (−45)
⟺ 32
Answer: A
2 Is known : = 4 + 2 −
2
= −36
4
Asked: = ⋯ ?
Answer :
= −36
4
2
4 + 2(4) − (4) = −36 20
4 + 8 − 16 = −36
12 − 16 = −36
−16 = −48
= 3
Answer : D
3 Is known : = =1
2
+3
= 3
Asked: = ⋯ ?
Answer :
= 3 20
2
=1 = 3
+3
2
− 1 = 3 + 9
2
− 3 − 10 = 0
( − 5)( + 2) = 0
10
