If f(x)=x^2-1 and g(x)=3f(x), graph g(x) and write the equation for g(x)

For this case we have the following function:
 f (x) = x ^ 2-1
 We write now g (x):
 g (x) = 3f (x)
 Substituting values we have:
 g (x) = 3 (x ^ 2-1)
 Rewriting we have:
 g (x) = 3x ^ 2-3
 
 The equation for g (x) is:
 g (x) = 3x^2 - 3