and we know that so . And we were also given: . Using this: . So the first three terms: .
For the second problem: . You can see that and therefore and the first three terms: .
Yo, some questions.
As in how do u do these. Thanks.
T5 = 3T2 and S6= 36, find the first three terms.
also
Sn = 5n2(sqaured that is) + 3n - Find the first three terms and thus find a formula for Tn
Sweet as Thanks.
Hello, Dev!
We are expected to know these formulas:
. .
. .
. . . . where: .
2nd term: .
Find the first three terms.
5th term: .
.[1]
.[2]
Substitute [1] into [2]: .
Substitute into [1]: .
The first term is 1, the common difference is 2.
Therefore, the first three terms are: .1, 3, 5.
Hello again, Dev!
The sum of the first terms is: .
Find the first three terms and thus find a formula for
The sum of the first one term is: .
The formula says: .
. . Hence: . .[1]
The sum of the first two terms is: .
The formula says: .
. . Hence: . .[2]
Substitute [1] into [2]: .
The first term is: . . . the common difference is: