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image.jpeg How do I find a and b ?
Original post by Jasminechen
image.jpeg How do I find a and b ?


Think about what simultaneous equations you could form.
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jas_7889
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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?
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dpm
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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.
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...
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jas_7889
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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 😀
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Tutortap
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Original post by Jasminechen
image.jpeg 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
0540_001.pdf34.4KB

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