Because that is a rule mathematicians agreed upon many years ago.
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Working the exponents or roots is first in the order of operations.You do those even before multiplication or division.
Parentheses Exponents Multiplication Division Addition Subtraction
BEDMAS= brackets, exponents,division,multiplication,addition,subtraction
Parentheses Exponents and Roots Division and Multiplication Addition and Subtraction
parentheses, exponents, multiplication, division, addition, and subtraction.