Math, 14.05.2020tayis

If a1 = 5 and a7 = 17, find the common difference

Answers

d=2

Step-by-step explanation:

a1=5, a7 =17

17=5+6d

12=6d

2=d

d= 2

Step-by-step explanation:

an= a1+(n-1)d

17= 5 + (7-1)d

17= 5+ 6d

6d= 17-5

6d= 12

\frac{6d}{6}=\frac{12}{6}

d= 2

FORMULA: an = a1+ (n-1) d

17=5+(7-1) d

-5+17=6d

12/6=6d/6

ANSWER: The common difference is 2.



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