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 \sqrt{75-12 \sqrt{21} }
Here  12 \sqrt{21}=2 \sqrt{756}
making factors of   2 \sqrt{756}
 \sqrt{ \sqrt{12}  ^{2}  + \sqrt{63}  ^{2}    -2  \sqrt{(12)(63)} }
using (a-b)^2 identity
 \sqrt{ (\sqrt{12} - \sqrt{63}) ^{2} }
\sqrt{12} - \sqrt{63
1 5 1
teacher only gave hw
In RD sharma and Pradeep their are similar problems you can practice from it
why lol
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