D=(3x+1)²-(3x-1)²
D= 9x²+6x+1-(9x²-6x+1)
D= 9x²+6x+1-9x²+6x-1
D= 12x
M= 12000
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D=(3x+1)²-(3x-1)²
D= 9x²+6x+1-(9x²-6x+1)
D= 9x²+6x+1-9x²+6x-1
D= 12x
M= 12000