how to remove square root of 21 ,give me step by step explaination
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Step-by-step explanation:
Solution: √21 = √(7 × 3)
√28 = √(7 × 4)
√21 + √28 = √(7 × 3) + √(7 × 4)
= √7 (3 + 4)
= √7 (7) = 7√7
√21 + √28 = 7√7
Answered by
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Answer:
√21≈4.58
Step-by-step explanation:
√21=√3⋅7 has no square factors that can be 'moved outside the square root sign'. So √21 cannot be simplified. It cannot be expressed as a rational number (fraction), so the best we can do with normal notation is to either stick with √21 or give an approximation, such as √21≈4.58 .
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