(3a-4b)²=(3a+4b)²-( )

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(3a-4b)²=(3a+4b)²-( )
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(3a-4b)²=(3a+4b)²-( )
(3a-4b)²=(3a+4b)²-( )

(3a-4b)²=(3a+4b)²-( )
(3a-4b)²=(3a+4b)²-(48ab)
9a²-24ab+16b²=9a²+24ab+16b²-()
()=48ab

(3a-4b)²=(3a+4b)²-48ab

4*3a*4b=48ab
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