Question

use factor theorem to determine wheater x+2is factor of x³+4x-5​

Answer 1

x-a is a factor of f(x) if f(a) =0

f(x) = x³+4x-5

f(-2) = -2³+4(-2) -5

=-8-8-5 = -21 which is not zero

so x+2 is not a factor of f(x)