Let "g" and "f" be two functions defined by

g(x) = x + 4

f(x) = x^2 + 4x - 21

for any real number "x".

Find all values of "x" that are NOT in the domain of the function g/f . If there is more than one value, separate them with commas.

Question

Let "g" and "f" be two functions defined by

g(x) = x + 4

f(x) = x^2 + 4x - 21

for any real number  "x".

Find all values of "x" that are NOT in the domain of the function g/f . If there is more than one value, separate them with commas.

anonymous · Answer

HELP PLEASE !!!!!!!!!!!!!!!!!!

anonymous · Answer

Putting g/f you get:
$${x-4}/{(x^2+4x-21)}$$. To find the values OUTSIDE of the domain, find where the denominator is zero. (factor the quadratic) because you can't have something divided by zero.