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\sqrt{45} = \sqrt{5*9} = \sqrt{5} * \sqrt{9} = 3 \sqrt{5}
\sqrt{125}= \sqrt{5*25} = \sqrt{5} * \sqrt{25} = 3 \sqrt{5}
\sqrt{20} = \sqrt{5*4} = \sqrt{5} * \sqrt{4} = 2\sqrt{5}
Luego respaldas :
3 \sqrt{5} - 3 \sqrt{5} - 2\sqrt{5}
respuesta : - 2\sqrt{5}