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This topic has 1 reply, 2 voices, and was last updated 5 years ago by John Moffat.

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April 29, 2020 at 10:17 am #569494
chandni24
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Question
how do we know when to use the formula y=ax^b and how do we know that the situation is not doubling
April 29, 2020 at 1:08 pm #569506
John Moffat
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Whenever the question has needed the formula, the examiner has given the value of b.
Otherwise it is just looking at the numbers involved – you can always use the formula but if it is 2,4,8 or 16 then it is obviously quicker to use the doubling rule.
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