(2x + 3)^3 - (3x +2)^3
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(2x + 3)³- (3x +2)³= (2x)³ +3* (2x)²*3 +3*2x*3² +3³ - [(3x)³ +3*(3x)²*2+3*3x*2 +2³]=
=8x³+36x²+54x+27 - 9x³-54x² -18x -8 =
=-x³ -18x² +36x + 19
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(2x + 3)³- (3x +2)³= (2x)³ +3* (2x)²*3 +3*2x*3² +3³ - [(3x)³ +3*(3x)²*2+3*3x*2 +2³]=
=8x³+36x²+54x+27 - 9x³-54x² -18x -8 =
=-x³ -18x² +36x + 19