Question

Find the first three iterates of the given function for the given intial value. *BEST ANSWER WILL GET MEDAL** _ is sub zero. I did not know how to do that on the computer. Thank you.
1.f(x)=4x^2-5,x_0=1/2
2.f(x)=4x+5,x_0=-1
3.f(x)=2x^2-1,x_0=1/2
4.f(x)=1/x^2,x_0=-1/2
5.f(x)=x^2+3,x_0=-2