PLEASE HELP C++

Question

I need to calculate the function y=f(x) using switch.
You’re given three X values that the program should prompt you to enter.
The answer should be y1=... y2=... y3=... or default“404”

function
1+sqrt(a+(fabs(x))) “by x=1”
2+(pow(a*x,2))+exp(x) “by x=5”
x+(sqrt(1+b*log(pow(a,2)*x)) “by x=7”

Answer 1

oops a=6,72 b=4,85

Answer 2

thanks

Answer 3

but, how i can use several conditions in one expression?