A = 4x²-25-(3x-1)(2x+5)
A = (2x+5)(2x-5) -(3x-1)(2x+5)
A = (2x+5)( 2x-5-3x+1)
A= (2x-5)( -x -4 )
B = x²-4(2x+3)²
B= (x+2)(x-2)(2x+3)²
C = 9x²(x+2)-12x(x+2)+4x+8
C= 9x²(x+2) -12(x+2) + 4( x+2)
C= (x+2) (9x² -12 +4)
C= (x-2) (9x²-8 )
D = x²+2x+1-16(4x²-20x+25)
D = (x+1)²- 16( 2x-5)²
E = (2x+1)(x-4)+2x(x+4)-5(x-1)
E = 2x² -8x +x -4 +2x² +8 -5x +5
E =4x² -4x +1
E = (2x - 1)²
