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

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

anonymous · Answer

@sikinder

welshfella · Answer

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

anonymous · Answer

the all real numbers except 9 is an answer choice

welshfella · Answer

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

anonymous · Answer

i got it wrong anyways

welshfella · Answer

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

welshfella · Answer

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

welshfella · Answer

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