3 years ago

Simplify the radical expression by rationalizing the denominator.

1 answer:

4 0

$\frac{4}{\sqrt{21}} = \frac{4}{\sqrt{21}} \times \frac{\sqrt{21}}{\sqrt{21}} =\boxed{ \frac{4\sqrt{21}}{21}}$

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bagirrra123 [75]

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3 years ago

Lisa [10]

Answer:

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hope its right

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You should always switch the signs to their opposites if you're mutiplying a negative such as the - (-5) Hope I make sense

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Answer:

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Step-by-step explanation:

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