(x+h)²¹-x² (x+h)-x 60. ab-3a + 5b-15 15+3a-5b-ab Identify the rational functions. 61. fx)--7x²+2x-5 64. f(x)= −1+3 x-2 (x+h)-x² (x+h)-x 62. JLx)- ²¹-2² +7 +2 65. f(x)=5x²-x 58. xy-2y +41-8 2y+6-ay-3 63. f(x)==-1 66. f(x) =*=+5 59.