The BODMAS rule was not discovered: it was invented as a convention. The purpose in setting out the convention was so that calculations were carried out in the same way by different people and at different times.
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BODMAS (or PEMDAS) is not a formula. It is a convention, agreed by mathematicians so that they work things out in the same way and therefore get the same answers (hopefully!).
The BODMAS rule was not discovered: it was invented as a convention. The purpose in setting out the convention was so that calculations were carried out in the same way by different people and at different times.
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You need to use BODMAS whenever you evaluate ANY formula.
BODMAS