2.2 Algebraic functions

$\left\{()\right\}$∞ 12 since $12-x\ge 0$

$\left\{()\right\}$∞ ∞ since there are no even-degreed roots and it is not a rational function

$\left\{()\right\}$∞ -5 -1 ∞ since $x^2+6x+5\ge 0$

$\left(-4 , ()\right)$∞ since $x+4> 0$

$\left\{()\right\}$∞ 0 0 7 since $7-x\ge 0$ and $x\neq 0$

$\left\{()\right\}$∞ 0 4 ∞ since $x^2-4x> 0$

$\left\{()\right\}$∞ -2 -2 -1 1 2 2 ∞ since $x^2-1\ge 0$ and $x^2-4\neq 0$

$\left[0 , 25\right)\cup \left(25 , ()\right)$∞ since $\sqrt{x}+5\neq 0$ and $x\ge 0$

$\left(-1 , ()\right)$∞ since $x+1> 0$