1). (6x-5)/(x^3-4x^2+3x-12)
2). (4x-3)/(x+1)^2
3). (x^2+7x+3)/(x^2 (x+3))
4). (x^3+4x^2+20x-7)/(x^4-2x^3+9x^2-16x+8)

please help me to answer these...