Question

if -1 is a zero of p(x)=ax cube-x+x+4,find the value of a

Answer 1

Answer:

a = 2

If -1 is a zero of p(x) , p(-1) = 0

So,

a(-1)³ - (-1)² + (-1)+ 4 = 0

-a -1 -1 + 4 = 0

2 - a= 0

a = 2