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25n^{2}-9m^{2}
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25n^{2}-9m^{2}
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-9m^{2}+15mn-15nm+25n^{2}
Apply the distributive property by multiplying each term of -3m-5n by each term of 3m-5n.
-9m^{2}+25n^{2}
Combine 15mn and -15nm to get 0.
-9m^{2}+15mn-15nm+25n^{2}
Apply the distributive property by multiplying each term of -3m-5n by each term of 3m-5n.
-9m^{2}+25n^{2}
Combine 15mn and -15nm to get 0.
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