Question

Find the zero function of f(x)=2x+7


Determine the domain of the function g(x)= x+2?x^2-9
A. {x|x≠3}
B. {x|x≠0, x≠±3}
C. {x|x≠±3}
D. {x|x≠0,x≠9}

Answer 1

I am assuming that the 0 function is when f(x)=0
which means that 2x+7=0
2x=-7
x=-7/2

Answer 2

For the First one I keep getting x=-7/2

Answer 3

which is correct. The function in the second part has a ? what does that mean

Answer 4

Oh okay so I wasn't wrong lol

Answer 5

A?

Answer 6

g(x)= x+2?x^2-9 y does it have a question mark?

Answer 7

ohhh its \( \huge \frac{x+2} {x^2-9} \)

Answer 8

Oh that was was a typo, its suppose to be typed like this....g(x)= x+2/x^2-9

Answer 9

Yes, like that you beat me to it lol :)

Answer 10

ok so then \(x^2-9=0\)
Since if the denomanator equals zero then it goes to infinity and stuff that we dont want
\(x^2=9\)
\( \sqrt{x^2}=\sqrt{9}\)
\(x= \pm 3\)

Answer 11

So its option number 3

Answer 12

since (3)^2=9 and (-3)^2=9

Answer 13

Oh I see so but what's the difference between choice A and C?

Answer 14

c is +3 and -3

Answer 15

A is only +3

Answer 16

Oh nvm I see now.... Thanks a million, you're giving better explanations than my teacher lol!

Answer 17

No problem :)