Fill the given blank. Given information: To rationalize the denominator

Fill the given blank.
Given information:
To rationalize the denominator of an expression with denominator $2\sqrt{5}$.
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Alara Mccarthy
Calculation:
For rationalizing, we have to multiply the numerator and denominator by the radical of the denominator. So here we have to multiply the numerator and denominator by $\sqrt{5}$.