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Simplify the radical expression by rationalizing the denominator
4/√21

User Granga
by
8.9k points

2 Answers

5 votes


(4)/(√(21)) =(4√(21))/(√(21)√(21)) =(4√(21))/(21)

User Swrobel
by
7.9k points
2 votes

I think


(4)/(√(21))

is about as simple as this is going to get. For some reason teachers like the radicals in the numerator, so we multiply top and bottom by
√(21) and get


(4)/(√(21)) * (√(21))/(√(21)) = (4√(21))/(21)

Answer:
(4√(21))/(21)

User Petr Matousu
by
7.7k points
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