What is the domain of f(x) = 5* – 7?
{x | X > -7}
{x | X <-7}
{x | x>0}
{x | x is a real number}

4

step-by-step explanation:

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).