1. The problem statement, all variables and given/known data Find all real values x that are fixed by the function y=4-x^2 f(x)=4-x^2 2. Relevant equations x=y 3. The attempt at a solution x=4-x62 0=-x^2-x+4 0=-(x^2+x+(1/4))+(17/4) This is where i get stuck. I also have two other problems which iIdo not understand how to work with. f(x)=7+sqrt(x-1) f(x)=sqrt(10+3x) -4 The main problem keeping me from doing the the two above is not knowing what to do with the square root of the expression underneath. Thanks in advance.