(5x+2y)²-(5x-2y)²
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(5x+2y)²-(5x-2y)²
=[(5x+2y)-(5x-2y)][(5x+2y)+(5x-2y)]
=(5x+2y-5x+2y)(5x+2y+5x-2y)
=4y*10x
=40xy
=[(5x+2y)-(5x-2y)][(5x+2y)+(5x-2y)]
=(5x+2y-5x+2y)(5x+2y+5x-2y)
=4y*10x
=40xy
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