a/
D = ( 4x - 7)(2x - 3) - (2x - 3)²
= 8x²-12x-14x+21 -(4x²-12x+9)
= 8x²-26x+21-4x²+12x-9
= 4x²-14x+12
b/
(2x-3)(4x-7-2x+3)
(2x-3)(2x-4)
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a/
D = ( 4x - 7)(2x - 3) - (2x - 3)²
= 8x²-12x-14x+21 -(4x²-12x+9)
= 8x²-26x+21-4x²+12x-9
= 4x²-14x+12
b/
D = ( 4x - 7)(2x - 3) - (2x - 3)²
(2x-3)(4x-7-2x+3)
(2x-3)(2x-4)