SOLUTION: Determine the domain of {{{f(a) = (a^2-16)/( a^2-3a-28)}}} So that is f(a) = a squared - 16 divided by a squared - 3a

SOLUTION: Determine the domain of {{{f(a) = (a^2-16)/( a^2-3a-28)}}} So that is f(a) = a squared - 16 divided by a squared - 3a - 28 Please help!! Thanks!

Question 91948: Determine the domain of
So that is f(a) = a squared - 16 divided by a squared - 3a - 28
Please help!! Thanks!
Answer by mathispowerful(115) (Show Source): You can put this solution on YOUR website!

Let's simplify this expression first

here a+4 canceled.
Now we have
Domain is a collection of all allowed x values.
in the above expression we have a -7 on the bottom, you know
it can not be 0, so a -7 can not be 0, that means a can not equal to 7,
the answer is a can be any real numbers except 7.
the graph of can verify the answer

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