Question

find x + 1/ x = 4 find ( x^2+ 1/ x^2) and ( x^3 + 1 / x^3)​

Answer 1

Answer:

]x+x1=3−22+3−221

x1=3−221×3+223+22=13+22

x+x1=3−22+3+22=6

Squaring on 60th sides. 

(x+x1)2=36

x2+x21=36−2⇒x2+x21=34

Squaring on 60th sides. 

(x2+x21)2=(34)2

x4+x41=1156−2⇒x4+x41=1154.