The non-repeated root of x3+4x2+5x+2= 0 is

f|(x)=0 ⇒3x2+8x+5=0⇒x=−1  and f-1=0 hence -1 is the  common root of fx=0 and f'x=0∴-1 is the repeated root let the roots be -1,-1,r sum of the roots = –4⇒−2+r=−4⇒r=−2, which is the non repeated root