At which value(s) is the expression
\[ \frac{x}{x^{2}+4} \] undefined?
a) (-2, 2)
b) x = ±2
c) never undefined
d) (-∞, -2) u (-2, 2) u (2, ∞)
e) (-∞, -2] u [-2, 2] u [2, ∞)

Triangle xyz, with vertices x(-2, 0), y(-2, -1), and z(-5, -2), undergoes a transformation to form triangle x′y′z′, with vertices x′(4, -2), y′(4, -3), and z′(1, -4). the type of transformation that triangle xyz undergoes is a . triangle x′y′z′ then undergoes a transformation to form triangle x′y′z′, with vertices x″(4, 2), y″(4, 3), and z″(1, 4). the type of transformation that triangle x′y′z′ undergoes is a .