Find the domain of $\frac{x^2 + 10x + 21}{x^2 + 4x - 21}$. (Express your answer using interval notation.)
+118608 Find the domain of $\frac{x^2 + 10x + 21}{x^2 + 4x - 21}$. (Express your answer using interval notation.)
\(\frac{x^2 + 10x + 21}{x^2 + 4x - 21}\\ =\frac{(x+3)(x+7)}{(x-3)(x+7)}\\ x\ne-7 \qquad x\ne3\\ Domain\quad(-\infty,-7)\cup (-7,3) \cup(3,\infty)\)
I think this is interval notation..?...
