Evaluate
9n^{2}-4m^{2}
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9n^{2}-4m^{2}
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-4m^{2}-6mn+6nm+9n^{2}
Apply the distributive property by multiplying each term of 2m-3n by each term of -2m-3n.
-4m^{2}+9n^{2}
Combine -6mn and 6nm to get 0.
-4m^{2}-6mn+6nm+9n^{2}
Apply the distributive property by multiplying each term of 2m-3n by each term of -2m-3n.
-4m^{2}+9n^{2}
Combine -6mn and 6nm to get 0.
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