(-5a-2b)( )=4b²-25a²

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(-5a-2b)( )=4b²-25a²

(-5a-2b)( )=4b²-25a²
(-5a-2b)( )=4b²-25a²

(-5a-2b)( )=4b²-25a²
4b²-25a²
=(2b+5a)(2b-5a)
=(-2b-5a)(-2b+5a)
所以,(-5a-2b)( -2b+5a )=4b²-25a²