A. ( x + 2 ) ( x - 3 ) = x² - 3x + 2x - 6 = x² - x - 6
b. ( 2x - 3 ) ( x + 4 ) =2x² + 8x - 3x -12 =2x² + 5x -12
c. ( 4k +l )² =16k² +12kl +l²
d. ( 3m +2n ) ( 3m - 2n ) = 9m² -6mn +6mn -4n² =9m² -4n²
e. ( 3 - a) (5 +a) =15 +3a - 5a - a² =15 -2a-a²
f. (2+a) (a²-2a+1) =2a²-4a+2+a³-2a²+a =2a²-2a²-4a+a+a³=-3a+a³