with the equation 𝑓(𝑥)=𝑥^2−4𝑥−5

with the equation 𝑓(𝑥)=𝑥^2−4𝑥−5

a) Determine the x-intercepts. List the value(s) of x separated by a comma, or none if there are none.
x= 

b) Find the solution(s) for: 𝑥^2−4𝑥−5=0  List the value(s) of x separated by a comma, or none if there are none.