Answer the following for the given quadratic function f(x)=x^2+8x+16

(a) Does the graph of f open up or down ?
(b) What is the vertex (h,k) of f?
(c) What is the axis of symmetry ?
(d) What are the intercepts if any ?
(e) What is the domain of f ?
(f) What is the range of f ?
(g) On what interval is f increasing ?
(h) On what interval is f decreasing ?

Please show all work. Any and all help is greatly appreciated.

a) It opens up

b) -b/2a, which means the x value is -4. The y-value is 0, so it's (-4, 0)

c) x = -4

d) (x + 4)^2

It intersects the x-axis at (-4, 0)

e) All real numbers

f) All real numbers greater than 0

g) x > -4

h) x < -4

I hope this information was very helpful.

a) up
b) (-4,0)
c) x = -4
d) (-4,0)
e) R
f) R+
g) x>-4
h) x<-4