I'm trying to find limits for 2 situations.
1. lim x->a
f(x)-f(a) if f(x)=x^2+4 gave me lim x ->a = 2a
2. lim x->a
f(x)*(x^3-a^3) if f(x)=a^3 and g(x)=a^2 so I got lim x->a = 2a^2(a+1)
My main concern is that so far in every situation where we had a letter instead of a number we could get rid of the letters eventually and get a number.
I'm wondering if the answers are correct and if not what might be the correct answer and/or steps to get there.