Answer:
√16×81 = 4×9 or √1296 = 36
√16×√81 = 4×9 = 36
Explanation:
√81×16
We simplify 81 and 16 by prime factorisation (expressing a number as a product of its prime factors).
√81 = √3×3×3×3 = √9×9 = √9² = 9
√16 = √2×2×2×2 = √4×4 = √4² = 4
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