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Solution 1.3:5a

From Förberedande kurs i matematik 1

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The number 4 can be written as 4=22=22 and then, using the power rules, we obtain

421=2221=2221=21=2 .

Note: Another way to denote 421 is 4  (the square root of 4); more on this in the section on roots later in the course.