I need help understanding whats going on...
Let f(x)=(x^2)-1 and g(x)=3x.
Find f * g.
1.(f * g)(x)=f(g(x))
2.---------=f(3x)
3.---------=((3x)^2)-1
4.---------=(9x^2)-1
I primarily dont understand line 3. How can 3x((x^2)-1)=((3x)^2)-1 ?
Perhaps you have a better way of explaining.
Trying to teach myself Algebra 2.