Question

Beeing "i" the imaginary unit (i2 = -1) I ask: how many real numbers exist for which (a + 1) 4 is a real number?

Answer 1

(a+1)^4 is always a real number for any real number a

Answer 2

sorry,I forgot: OPTIONS: a) 1
b) 2
c) 3
d) 4
e) infinits

Answer 3

i guess infinity would be the correct choice

Answer 4

why?I want accounts to understand and not a "kick" '-'

Answer 5

someone to give me an answeer??