Question

What is the domain of the function f(x)=x−5x2−9?
all real number except 9

all real numbers except 3 and -3
all positive real numbers
all real numbers except 5 and 9

Answer 1

@sikinder

Answer 2

are you sure you have the function right?
as it stands the domain is all real numbers

Answer 3

the all real numbers except 9 is an answer choice

Answer 4

yes but there is no reason why 9 cant be in the domain
f(9) = 9 - 5(9)^2 - 9 = -405

Answer 5

i got it wrong anyways

Answer 6

are you sure there is not a division in the function?

Answer 7

x^2 - 9 for example then the second option would be correct