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Eva8 [605]
3 years ago
13

2xy + 5 - 8 +3xy -y +7 + 3 y= ___ xy -8 ____ + ___ y +___ I don't understand help please :*

Mathematics
1 answer:
cestrela7 [59]3 years ago
6 0
2xy + 5 - 8 + 3xy - y +7 + 3y = 5xy - 8 + 2y + 12
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PLEASE HELP
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Answer:

\sum\limits^7_{n=1}(4n - 3)

Step-by-step explanation:

Given

1 + 5 + 9 + .....

Required

Write a definition

First, we derive a formula for the series using:

T_n = a + (n - 1)d

From the attached data;

a = 1

d = 5 - 1 = 4

So:

T_n = a + (n - 1)d

T_n = 1 + (n - 1) * 4

T_n = 1 + 4n - 4

Collect like terms

T_n = 4n - 4+1

T_n = 4n -3

So, the definition for first 7 terms is:

\sum\limits^7_{n=1}(4n - 3)

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