p, 5p-8, 3p+8 for first term, second term, 3rd term
I can work out that p=4 by working out the difference between the sequences, but then when you are asked to work out the 40th term of the sequence, the mark scheme says that d=8 is implied.
How do you get d=8 from that?
I know p (or a) = 4, by working out the differences between the terms. HOwever, how do you work out that d=8? I see that second term is -8 and third term is +8 but why does it vary from -8 to +8? Doesn't the value before p (so 5p or 3p) affect the value of d?
Please can somebody explain, it would be greatly appreciated.