Let for all real for which it is defined

MATHEMATICS · Single correct · AP · AP Precalculus · Polynomial and Rational Functions · Polynomial and Rational Functions

Problem

Let

f(x)=\dfrac{x^{2}-1}{x^{2}-4}

for all real

x

for which it is defined. How many points of discontinuity does

f

have on the real number line? (a) 4 (b) 1 (c) 2 (d) Infinitely many