What is the domain of f(x)= [tex] \frac{1}{ \sqrt{ {x}^{2} \: - 6x - 7} } [/tex] A. (1,7) B. { x < -1} U {x > 7} C. [-1,7] D. (- infinity, -1] U [ 7, infinity) E. x > -1 or x < 7
For example, the domain of f (x)=x² is all real numbers, and the domain of g (x)=1/x is all real numbers except for x=0. We can also define special functions whose domains are more limited.
