Factoriser
D= x(x-5)+(3x-1)(x-5)
D= (x-5)[x+(3x-1)]
D= (x+5)(x+3x-1)
D= (x+1)(4x-1)
E= x²-6x+9-(x-3)(2x+1)
E= (x-3)(x-3)-(x-3)(2x+1)
E= (x-3)[(x-3)-(2x+1)]
E= (x-3)(x-3-2x-1)
E= (x-3)(-x-4)
F= (2x-3)(x+2)+(2x-3)(2x+3)
F= (2x-3)[ (x+2)+(2x+3)]
F= (2x-3)(x+2+2x+3)
F= (2x-3)(3x+5)