How do you find √25√81?
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Prime factorisation of 25 gives 5×5. Grouping the factors by taking two at a time gives the square root. So 5 is the root of 25.
Prime factorisation of 81 gives 3×3×3×3. Grouping the factors by taking two at a time gives 3×3 which is 9. So 9 is the root of 81.
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