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C1 Sequence question help!

Hello there, I am trying to work out this question. I have already worked out A which are:
U1 = 1 U2 = 7 U3 = 25 and U4 = 79

However, I am stuck on B.
I attempted to work out the first four terms for the other sequence. How do I find A and B?
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Avatar for Munrot07
Munrot07
18
Original post by MelonKuma
Hello there, I am trying to work out this question. I have already worked out A which are:
U1 = 1 U2 = 7 U3 = 25 and U4 = 79

However, I am stuck on B.
I attempted to work out the first four terms for the other sequence. How do I find A and B?


At U1, Un+1 = U2 so you can create an equation

7 = A(1) + b,

At U2, Un+1 = U3 so you can create an equation

25 = A(7) + b

You then have simultaneous equations
Reply 2
Avatar for MelonKuma
MelonKuma
OP
9
Original post by Munrot07
At U1, Un+1 = U2 so you can create an equation

7 = A(1) + b,

At U2, Un+1 = U3 so you can create an equation

25 = A(7) + b

You then have simultaneous equations

Thank you so much!

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