C=(2x+1)(x-5)-(3x-4)(2x+1)
=(2x+1)[(x-5)-(3x-4)]
=(2x+1)(x-5-3x+4)
C=(2x+1)(-2x-1)
D=x(3x-1)+9x-3
=x(3x-1)+3(3x-1)
D=(3x-1)(x+3)
E=(8x-6)(2-4x)-(4x-3)²
=2(4x-3)[(2-4x)-(4x-3)²
=(4x-3)[2(2-4x)-(4x-3)]
=(4x-3)[(4-8x)-(4x-3)]
=(4x-3)(4-8x-4x+3)
E =(4x-3)(7-12x).