Question

Choose the correct or the most suitable answer from the given four alternatives:

A zero of x³ + 64 is _______ 

(a) 0 

(b) 4 

(c) 4i 

(d) -4

Answer 1

(d) -4

x³ + 64 = 0 

⇒ x³ = -64

⇒ x³ = (-4)³

⇒ x = -4