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# Help watch

1. How do I find a and b ?
2. (Original post by Jasminechen)
How do I find a and b ?
Think about what simultaneous equations you could form.
3. (Original post by SeanFM)
Think about what simultaneous equations you could form.
Do I add the first four terms together to get the first expression?
4. (Original post by Jasminechen)
Do I add the first four terms together to get the first expression?
the difference between consecutive terms is constant.
hence find the difference between 2 pairs of consecutive values and equate .. now do it again and solve the simultaneous eqns.
5. (Original post by Jasminechen)
Do I add the first four terms together to get the first expression?
I was thinking more like you know that the difference between the nth term and the (n+1)th term (eg 2nd and 3rd term) is d, so if you find two equations for that...
6. (Original post by SeanFM)
I was thinking more like you know that the difference between the nth term and the (n+1)th term (eg 2nd and 3rd term) is d, so if you find two equations for that...
Okay thanks 😀
7. (Original post by Jasminechen)
How do I find a and b ?
Hi Jasmine,

That is quite tricky!

Attached is a step by step guide of how to solve the problem.

Hope this helps.

Cheers,
James & TutorTap Team
Attached Images
8. 0540_001.pdf (33.6 KB, 50 views)

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Updated: October 26, 2015
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