C1 Questions Help?
1) The 5th term of an arithmetic series is 14 and the sum of the 5th term is -3
a)Use algebra to show the first term of the series is -6 and calculate common difference
a)Use algebra to show the first term of the series is -6 and calculate common difference
\???
What is the general formula for the nth term of an AP, and what is the formula for the first n terms of an AP?
Also, you know the value of the sum of the first 4 terms
Also, you know the value of the sum of the first 4 terms
Original post by sfaraj
\???
(edited 7 years ago)
Original post by an_atheist
What is the general formula for the nth term of an AP, and what is the formula for the first n terms of an AP?
Also, you know the value of the sum of the first 4 terms
Also, you know the value of the sum of the first 4 terms
nth term = a+(n-1)d
first n terms...
sum = n/2 [2a+ (n-1)d]
Original post by sfaraj
nth term = a+(n-1)d
first n terms...
sum = n/2 [2a+ (n-1)d]
first n terms...
sum = n/2 [2a+ (n-1)d]
So in general terms, what is the fifth term?
Also, think about the fourth term of the sequence. it might help (I dont know)
(edited 7 years ago)
Original post by an_atheist
so in general terms, what is the fifth term?
Also, think about the fourth term of the sequence. It might help (i dont know)
Also, think about the fourth term of the sequence. It might help (i dont know)
yes it just clicked
Original post by sfaraj
1) The 5th term of an arithmetic series is 14 and the sum of the 5th term is -3
a)Use algebra to show the first term of the series is -6 and calculate common difference
a)Use algebra to show the first term of the series is -6 and calculate common difference
Basic simultaneous equations in and .
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