How do you write the expression #r*r*r*r# using exponents?
The short way to write repeated addition is multiplication.
Multiplication is a stronger operation than addition.
In a similar way, the short way to write repeated multiplication is using indices or exponents.
Note the difference between
Indices are stronger than multiplication, which is why in an expression with mixed operations, the order is:
powers and roots
multiply and divide
addition and subtraction