Question

How do I find the first term of a sequence if I am given a random term and the common difference or ratio?

Answer 1

well try to solve from right and left side both

Answer 2

How do I know which is right when I get to it?

Answer 3

then try with division, multiplication, adding, subtracting one of them will give a number of a sequence.

Answer 4

is ita book question or a worksheet?

Answer 5

I'm just asking the questions that he said I have to know, so I don't have any practice problems.

Answer 6

so if u are given a random number and u have to find the 1 number of the s sequence right that what u are asking when u don't know whether it's right or wrong.

Answer 7

so when u find ur sequence number are same then it will be they right answer.

Answer 8

Could you type that more clearly, I couldn't understand that.

Answer 9

ok

Answer 10

what i am trying to make u understand is that u have to try all these way to get the right number and when u get that number continuously for 2 or 3 time then its a right answer.

Answer 11

Ok

Answer 12

now also if u don't understand send me the question i will try to solve it and show u how it works.

Answer 13

Ok

Answer 14

Ok

Answer 15

suppose we are given fifth term which is equla to 15 ( which is not frist term) and common difference is 3. let this sequence be in AP
Hence \[t_5 = 15 \rightarrow n= 5\] and d= 3 a=?
\[t_n = a+(n-1)d \rightarrow t_5 =a+(5-1)3\]
\[15 =a+(5-1)3 \rightarrow 15 =a+4 \times 3 \rightarrow 15 =a+12\]
i.e. a=15- 12
i.e. a= 3
Hence the first term a= 3

@Ben_Henderson

Answer 16

Huh?

Answer 17

I haven't learned this yet...

Answer 18

is that an example of find a sequence number?

Answer 19

*finding