Ignore my math if im wrong

Find the x-values (if any) at which f(x) is not continuous. Which of these discontinuities are removable? X 17) f(x ) = 18) f(x ) = - X - 3 19) f ( x ) = - * + 2 X x2 - 9 x2 - 3x - 10 x2 - 3 x40 * 2 H=0 x - 9= 0 (*3) ( x+ 3 ) ( x + 2) ( x - 5 ) = 0 * 2=-1 * * - 2, 5 x = 3 zX +1, x52 20) f ( x ) = - X + 2 1x+21 21 ) f ( x ) = 3 - X, x> 2