For a rational function

MATHEMATICS · Single correct · A Level · Mathematics · Algebra and Functions · Algebra and Functions

Problem

f(x)=\dfrac{P(x)}{Q(x)}

, the real numbers that must be excluded from its domain are those for which (a)

P(x)=Q(x)

(b)

Q(x)=0

(c)

P(x)=0

(d)

P(x)\,Q(x)=0