Question

If -1 is a zero of the polynomial p(x)=ax 3 -x 2 +x+4, find the value ofa `a`

Answer 1

To check -1 is a zero of the polynomial p(x)=ax 3 -x 2 +x+4 we will put x= -1 in given equation,,, => a(-1)^3-(-1)^2+(-1)+4=0 => -a-1-1+4=0 => -a= -2 => a= 2