You should already have looked at indices in Number / Powers and roots - Foundation before working through this Revision Bite.
Index notation
Index notation is used to represent powers, for example
a2 means a × a and here the index is 2
b3 means b × b × b and here the index is 3
c4 means c × c × c × c and here the index is 4
etc.
When there is a number in front of the variable:
4d2 means 4 × d × d
2e3 means 2 × e × e × e
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