Need some help with part A

2. Let P=(x, y) be a point on the graph of y = x^2 - 8.

a) Express the distance of d from P to the point (0, -1) as a function of x.

b) What is d if x = 0?

c) What is d if x = -1?

d) Use a graphing utility to graph d = d (x).

e) For what values of x is d smallest?

Answers

a) d(x) = √x^4-13x^2+49

b) d(0)=7

c) d(-1)= √37 ... is similar to ... 6.08

d) Graph d(x) = √x^4-13x^2+49

e) D is the smallest when x ... is similar to ... -2.55 or x ... is similar to ... 2.55

I can do all of them but part “A” can someone help me figure out how to find out part A?

and how do you do a "... is similar to ..." sign on here?