Question

anyone know what is domian in a graph

Answer 1

Domain = what values is X allowed to be.

Answer 2

on the graph there are two points on x -9 and 9 the line curves down to -8y

Answer 3

Do you mean those are the intercepts on the axes?

Answer 4

yea

Answer 5

Does it happen to be a parabola opening upward?

Answer 6

the line is in a u shape form

Answer 7

Ok, then in that case, the domain is unrestricted and X could be anything. There are different ways of stating that depending on what notation you like to use.

Answer 8

it wants me to write the domain function and range function

Answer 9

Domain and range functions? Hmm, I guess that means inequality notation. e.g. since X can go from negative infinity to positive infinity, you could write: -∞ < x < ∞.

Answer 10

Oh, you mean domain and range *of* the function. If it doesn't specify notation, you can choose what you like. The other common notation is interval/bracket notation. The domain for that parabola would look like (-∞,∞).

Answer 11

Interval notation is often preferred because it is more compact. Can you see from the graph what the range of Y values can be?

Answer 12

on the y axis the line curves on -8

Answer 13

And the graph doesn't go below -8, right?

Answer 14

If -8 is your lower bound then you can say either y≥-8 or [-8,∞) for the range.

Answer 15

ok thanks