$${\left( {15} \right)^2} + {\left( {18} \right)^2} - 20 = \sqrt ? $$
A. 22
B. 23
C. 529
D. 279841
E. None of these
Answer: Option D
Solution (By Examveda Team)
$$\eqalign{ & {\text{Let, }} \cr & {\left( {15} \right)^2} + {\left( {18} \right)^2} - 20 = \sqrt x \cr & {\text{Then, }} \cr & \sqrt x = 225 + 324 - 20 \cr & \Leftrightarrow x = {\left( {529} \right)^2} \cr & \Leftrightarrow x = 279841 \cr} $$This Question Belongs to Arithmetic Ability >> Square Root And Cube Root
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