I need some help!!
Identify the domain of the graph of y = -x2 - 6x - 13

Question

I need some help!!
Identify the domain of the graph of y = -x2 - 6x - 13

campbell_st · Answer

well what x values could you input into the equation...to get a y value..?

anonymous · Answer

I don't know??

anonymous · Answer

i might know

campbell_st · Answer

well the domain is the values of x that you can input... 

could you put in say 

-30

500, 

-20000

and get a y value...?

anonymous · Answer

oh so you are suppose to substitute something for x ?

anonymous · Answer

x ≤ -4
	x ≥ -6
	x ≥ -2
These are the options that they gave me 
So could you use one of these for x?

campbell_st · Answer

here are some good on-line notes that help to understand domain and range http://www.purplemath.com/modules/fcns2.htm

campbell_st · Answer

lol... well then that's funny as there must be a little more to the question.

as the domain for the curve that you have posted is all real x.

anonymous · Answer

So the domain is all real numbers?

campbell_st · Answer

that would be my answer... but you weren't given that choice

anonymous · Answer

ok thanks so much for your input in really helps!!:)

anonymous · Answer

thx @campbell_st

anonymous · Answer

that is all real number lol lifesaver guys ;)