Hi How do I approach the question below:

Let f(x)= 2x^2 - 5,g(x)= 3-4x, k(x) = 6x/(x^2-2)

Find the following and simplify:

a)g(-1)

b) (g+k)(1)

c)(fk)(2)

d f(g(1)

e (f(x+h) - f(x))/h

I am extremely rusty.Can anyone help me solve these.Give me leads

For instance for a)g(-1)

Do I substitute 1 into the equation: g(x)= 3-4x

Thanks