a , \(x^2\left(x-1\right)+\left(x-1\right)=0\)

\(\left(x-1\right)\left(x^2+1\right)=0\)

\(x=1\)

b , \(\left(x-2\right)\left(x^2-16\right)=0\)

\(\left(x-2\right)\left(x-4\right)\left(x+4\right)=0\)

\(x=2,x=4,x=4\)

a , x2(x−1)+(x−1)=0

(x−1)(x2+1)=0

x=1

b , (x−2)(x2−16)=0

(x−2)(x−4)(x+4)=0

x=2,x=4,x=4