e4t−10e3t+29e2t−22et+4=0 ...(i) Let et=x and roots of (1) be t1,t2,t3,t4 ∴x4−10x3+29x2−22x+4=0 Then, roots are x1,x2,x3,x4 product of roots x1.x2.x3.x4=4 ⇒et1.et2.et3et4=4 ⇒et1+t2+t3+t4=4 t1+t2+t3+t4=loge‌4=loge‌22=2loge‌2 Sum of roots =2loge‌2