What is the domain of y=2x squared -4

Question

hartnn · Answer

$y=2x^2-4$
is a polynomial and all polynomials have domain as all real numbers as x can take any rela value :)

hartnn · Answer

**real value.

anonymous · Answer

I havevno idea what your talking about..

anonymous · Answer

How do you find it

hartnn · Answer

you know the meaning of domain ?

hartnn · Answer

i am here to give you the idea :)

hartnn · Answer

see, domain is the set of values which the variable 'x' can take. 

so, if i consider f(x) = 1/x , then x CANNOT take the value 0, right ? because the denominator cannot be =0 . 
hence the domain of this f(x) = 1/x is all real numbers except 0.
makes sense so far ?

anonymous · Answer

Yeah

hartnn · Answer

one more example! $f(x)=\sqrt x$
here x cannot take negative values.  square root of a negative number is not real.

so the domain of this f(x) is x>= 0 
because x needs to be positive (or can be 0)

does this one makes sense too ?

anonymous · Answer

No I suck at math and I'm finna fail this test

hartnn · Answer

which part did u not get ?