1.

What is the simplified value of \(\frac{{\sqrt 5 \; + \;\sqrt 4 }}{{\sqrt 5 - \sqrt 4 }} + \frac{{\sqrt 5 - \sqrt 4 }}{{\sqrt 5 \; + \;\sqrt 4 }}\)?

A. 9
B. 10
C. 18
D. 20
Answer» D. 20


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