Question 125562
I'm going to assume that your function is {{{f(x) = x^2+7x+10}}}, because you didn't specify the sign in front of the 7x term.


To evaluate f(a) given f(x), you simply substitute a for x everywhere it occurs in the function and do the required arithmetic.


{{{f(x) = x^2+7x+10}}}, then {{{f(0)=(0)^2+7(0)+10=10}}}.


I'm assuming that you know how to do arithmetic, so I'm going to leave the other two problems in your capable hands.