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Hali07
30.07.2020 •
Mathematics
What is the explicit formula for this sequence?
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Ответ:
Greetings from Brasil...
With the recursive formula, lets build the sequence:
A1 = 4
A2 = A1 - 7
A3 = A2 - 7
A4 = A3 - 7
A5 = A4 - 7
(...)
But pay attention to A3
A3 = A2 - 7 but A2 = A1 - 7 , so rewriting A3
A3 = (A1 - 7) - 7 ⇒ A3 = A1 + 2.(- 7)
A4 = A3 - 7 ⇒ A4 = [(A1 - 7) - 7] - 7 = A1 + 3.(- 7)
A5 = {[(A1 - 7) - 7] - 7} - 7 = A5 + 4.(- 7)
so
An = A1 + (n - 1).(- 7)Ответ:
EBF= 51, EBA = 90, DBE = 17, DBC = 107, ABF = 141, DBF = 68
Step-by-step explanation:
EBF, 90-39 EBA, 180-90 DBE, 90-73, DBC,17+90 ABF, 90+51, DBF, 17+51