Rachel's answer to Hi's Secondary 2 Maths Singapore question.
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Not sure what u use in school but there's a formula for patterns like these with a fixed common difference which is a + (n-1)d where a is the first term and d is the common difference. Sub in the first term which is 10x+2 and common difference which is - x + 3. For c), bring all x to the right side and extract n. You'll get n=14 :)
Date Posted:
3 years ago
The formula would be good to remember and can be your "cheat" formula but it's only for fixed common differences so it can't be used for patterns like
1, 2, 4, 7, 11, 16 where there is no common difference.
1, 2, 4, 7, 11, 16 where there is no common difference.
Hope I helped!
Thank you
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