help

1.  k(x)  = g(x) + h(x)

2.  k(x)  = g(x) - h(x)

3.  k(x)  = g(x) * h(x)

4.  k(x)  = g(h(x))

5.  k(x)  = g(x) * h(x)

6.  k(x)  = h(g(x))

1. x not equal 0

2. x not equal to 1, 2

3. x not equal to -2

4. no restictions

5. x not equal to -1