\[\left( 25^{\frac{1}{4}} - 3^{\frac{1}{2}} \right)\left( 25^{\frac{1}{4}} + 3^{\frac{1}{2}} \right) =\]
\[= \left( 25^{\frac{1}{4}} \right)^{2} - \left( 3^{\frac{1}{2}} \right)^{2} =\]
\[= \left( 5^{2} \right)^{\frac{1}{2}} - 3 = 5 - 3 = 2\]